DoubleSpace disk compression creates more disk space by compressing your files so that they use less space.
Using DoubleSpace Setup
-----------------------
During DoubleSpace Setup, you will need to make some choices. DoubleSpace displays choices in a box. To choose the highlighted option, just press ENTER. To choose a different option, press the UP ARROW or DOWN ARROW key to highlight the option you want, and then press ENTER.
What Happens During DoubleSpace Setup?
--------------------------------------
The DoubleSpace Setup program configures your computer for disk compression, and then compresses the drive of your choice.
Note: After you compress a drive, you cannot decompress it.
Once you install it, DoubleSpace disk compression is built into MS-DOS. When MS-DOS starts, it loads DBLSPACE.BIN, the part of MS-DOS that provides access to compressed drives, along with other operating system components. MS-DOS loads DBLSPACE.BIN before carrying out the commands in your CONFIG.SYS file.
After you install DoubleSpace, you can run the DoubleSpace program to maintain your compressed drives and to compress additional drives. To run it, type DBLSPACE at the command prompt.
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Help -- Choosing Express or Custom Setup
You can choose either Express Setup or Custom Setup.
When you run Express Setup, DoubleSpace compresses the existing files on drive C and determines compression settings for you. This is the easiest way to compress the data on your hard disk.
When you run Custom Setup, DoubleSpace gives you a choice of which drives to compress, and gives you the chance to specify compression settings yourself. Choose Custom Setup to compress the data on a drive other than drive C, or to create an empty compressed drive using the free space on an existing drive.
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Help -- Choosing a Compression Method
There are two ways to create a compressed drive.
If you choose "Compress an existing drive," DoubleSpace compresses the existing files on the hard disk drive of your choice. When DoubleSpace finishes, the drive will have more free space. (The drive will contain most of the same files as before; the only exceptions are files that cannot be compressed. DoubleSpace creates a new uncompressed drive to contain those files.) The "Compress an existing drive" option is particularly useful if your hard disk is getting full.
If you choose "Create a new empty compressed drive," DoubleSpace uses some of the space on a hard disk drive to create a new compressed drive. The result is a new empty drive that contains more free space than the amount used to create the drive. You might want to choose this option if your hard drive has plenty of free space, or if you do not want to compress your existing files.
NOTE: After you compress a drive, you cannot decompress it.
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Help -- DoubleSpace Has Finished Compressing Your Drive
DoubleSpace has finished compressing the drive you selected, and displays the following information:
* How much free space the drive contained before DoubleSpace
compressed it.
* How much free space the drive contains now.
* How long DoubleSpace took to compress the drive.
* The compression ratio, which shows how much DoubleSpace was
able to compress the files on the drive.
DoubleSpace also shows the drive letter and size of the new
uncompressed drive it created. This drive contains uncompressed
space for files that must remain uncompressed. (The drive also
contains the "compressed volume file"~HL84~ for your
newly compressed drive.)
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Help -- DoubleSpace Has Finished Compressing Your Drive
DoubleSpace created a new compressed drive by using free space from the drive you selected. DoubleSpace displays the following information:
* How much space on your existing drive DoubleSpace used to
create the new compressed drive.
* How much free space the new compressed drive contains.
* The compression ratio for the new drive.
* How long DoubleSpace took to create the new drive.
* How much free space remains on your existing drive.
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Help -- Restart Your Computer Now?
The Restart Your Computer Now dialog box appears if you have just made changes in the Options dialog box and DoubleSpace needs to restart your computer in order for your changes to take effect.
To restart your computer now, choose Yes.
To continue without restarting your computer, choose No. You can continue using DoubleSpace, but the changes you made in the Options dialog box will not take effect until you restart your computer.
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Help -- Selecting a Drive to Compress
You have specified that you want to compress an existing drive. You must now specify which drive to compress.
DoubleSpace lists the compressible drives and shows how large each will be after it is compressed.
Choose the drive you want by pressing the UP ARROW or DOWN ARROW key, and then press ENTER to continue.
If the drive you want to compress does not appear on the list, check the following:
* Make sure the disk is formatted.
* Make sure the drive contains enough free space. To compress your
startup hard disk drive, the drive must contain at least
1.2 MB of free space. Other hard disk drives and floppy
disks must contain at least .65 MB of free space. (DoubleSpace
cannot compress 360K floppy disks.)
* If you are trying to compress a floppy disk or other
removable media, make sure the disk is in the drive and the
drive door closed.
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Help -- Selecting an Existing Drive to Use
You have specified that you want to create a new compressed drive by using space on an existing drive. You must now specify the drive that contains the space you want to use.
DoubleSpace lists the available drives; for each drive, DoubleSpace shows how large the new drive will be if you use the free space on that existing drive.
Choose the drive you want by pressing the UP ARROW or DOWN ARROW key, and then press ENTER to continue.
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Help -- Specifying Compression Settings
When DoubleSpace compresses the selected drive, it also creates a new uncompressed drive. This new drive will contain any files from the selected drive that must remain uncompressed (such as the Windows permanent swap file).
This screen shows the settings DoubleSpace will use to create the new uncompressed drive. To change a setting, press the UP ARROW or DOWN ARROW key until the setting you want is highlighted, and then press ENTER to display alternatives. You can change the following settings:
Free space on new uncompressed drive
Shows how much free space the new drive will contain. If you are
not sure how much space you will need, use the recommended size.
If the drive you are compressing a drive contains your Windows
permanent swap file, DoubleSpace takes it into account when
calculating the free space needed, moves the swap file to the
new drive, and adjusts your Windows installation accordingly.
You need to specify enough free space for a Windows permanent
swap file only if you are planning to create one but have not
yet done so. (For more information about the Windows permanent
swap file, see your Windows documentation.)
Drive letter of new uncompressed drive
Shows the drive letter DoubleSpace will assign to the new drive.
You can specify a different letter, if you want.
By default, DoubleSpace Setup uses the fifth drive letter after
the last used drive letter. For example, if E is the last drive
letter currently in use, DoubleSpace Setup assigns the new
drive the letter J. Once you have installed DoubleSpace, it
assigns the new drive the last drive letter that is marked as
available for use by DoubleSpace.
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Help -- Specifying Compression Settings
DoubleSpace displays the settings that will be used when creating the new compressed drive. To change a setting, press the UP ARROW or DOWN ARROW key until the setting you want is highlighted, and then press ENTER to display alternatives. The following describes each setting:
Free space to leave on drive X
Shows how much free space the selected drive will have after
the new drive is created. You can change the amount of free
space that DoubleSpace leaves on the selected drive.
Compression ratio of new drive
Shows the estimated compression ratio of the new drive.
DoubleSpace uses this ratio to estimate how much data you will
be able to store on the new drive. The default ratio is 2 to 1;
you might want to specify a different ratio if you plan to store
files that will compress at a ratio other than 2 to 1.
Drive letter of new drive
Shows the drive letter DoubleSpace will assign to the new drive.
By default, DoubleSpace assigns the last unused drive letter,
but you can specify a different letter if you want.
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Help -- Free Space on the New Uncompressed Drive
When DoubleSpace compresses a drive, it also creates a new uncompressed drive to hold any files that must remain uncompressed.
On this screen, you can specify how much free space you want the new uncompressed drive to contain. The more free space you allocate to the new uncompressed drive, the less free space your compressed drive will have.
Note: Some applications require some free uncompressed disk space
in order to work properly. It might be a good idea to
allocate some space to the new uncompressed drive in case
that space is needed by your applications.
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Help -- Specifying Free Space for the Existing Drive
When DoubleSpace creates the new compressed drive, it uses some or all of the space on the existing drive.
On this screen, you can specify how much free space you want DoubleSpace to leave on the existing drive. The more free space you leave on the existing drive, the smaller the new drive will be.
Note: Some applications require some free uncompressed disk space
in order to work properly. It might be a good idea to leave
some disk space uncompressed in case that space is needed by
your applications.
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Help -- Specifying a Different Drive Letter
When compressing an existing drive, DoubleSpace also creates a new uncompressed drive to hold any files that must remain uncompressed. By default, DoubleSpace skips four drive letters, and then assigns the next available drive letter to the new drive.
To assign a different letter to the new drive, type the letter you want, or press the UP ARROW or DOWN ARROW key until the letter is selected. Then, press ENTER.
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Help -- Specifying a Different Drive Letter
By default, when creating a new compressed drive, DoubleSpace assigns it the last drive letter that is available for DoubleSpace's use.
To assign a different letter to the new drive, type the letter you want, or press the UP ARROW or DOWN ARROW key until the letter is selected. Then, press ENTER.
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Help -- Specifying a Compression Ratio
In this screen, you can change a drive's estimated compression ratio. To choose a different ratio, press the UP ARROW or DOWN ARROW key until the ratio you want is selected, and then press ENTER.
The estimated compression ratio is a number that DoubleSpace uses to calculate the amount of free space on a compressed drive. You might want to change this ratio if it differs greatly from the actual compressibility of the files you plan to store.
For example, you might want to specify a higher estimated compression ratio if you plan to store extremely compressible files such as bitmap files. You might want to specify a lower ratio if you will store files that will not compress much further, such as certain program (.EXE or .COM) files.
Note: Changing a drive's estimated compression ratio does not
affect how much DoubleSpace actually compresses the files
on that drive; it changes only the way DoubleSpace estimates
the free space on the compressed drive.
Having the wrong estimated compression ratio for your files can cause DoubleSpace to provide inaccurate space estimates to MS-DOS, which can, in turn, result in problems when storing files. If the ratio is too high, DoubleSpace overestimates the amount of free space; the DIR command might then report that more space is free than is actually available. If the ratio is too low, MS-DOS might be unable to copy a file even though there may be plenty of space for that file.
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Help -- Confirming Compression
DoubleSpace is about to compress the drive you selected.
Note: After you have compressed a drive, you cannot decompress it.
To compress the selected drive, press C. DoubleSpace will then compress the drive. (If you are running DoubleSpace Setup, it will also restart your computer to load DBLSPACE.BIN, the part of MS-DOS that provides access to compressed drives.)
To return to the previous screen, press ESC. You can then review and change any choices you made.
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Help -- Confirming Compression
DoubleSpace is about to create the new compressed drive using free space on the drive you selected.
To create the new drive, press C. DoubleSpace will then create the new compressed drive. (If you are running DoubleSpace Setup, it will also restart your computer to load DBLSPACE.BIN, the part of MS-DOS that provides access to compressed drives.)
To return to the previous screen, press ESC. You can then review and change any choices you made.
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Help -- Main DoubleSpace Screen
The main DoubleSpace screen lists all the compressed drives that are currently mounted. The list includes hard disks, floppy disks, and other removable media.
To display information about a drive, press the UP ARROW or DOWN ARROW key until the drive you want is selected, and then press ENTER.
From the main DoubleSpace screen, you can work with compressed drives, compress or mount additional drives, and create new compressed drives. For more information about the tasks you can carry out from the main DoubleSpace screen, choose one of the following topics:
"Working with Compressed Drives"~HL76~
"Compressing an Existing Drive"~HL80~
"Creating a New Compressed Drive"~HL83~
"Mounting Compressed Volume Files"~HL95~
"Working With Floppy Disks"~HL89~
"Understanding DoubleSpace Terms"~HL81~
Note: You can also work with compressed drives from the MS-DOS
command prompt by using the DBLSPACE command. For more
information, type HELP DBLSPACE at the command prompt.
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Help -- Compressed Drive Information
The Compressed Drive Information dialog box contains the following information about the selected compressed drive:
Space free An estimate of the free space on the drive. The
actual amount of data you will be able to store in
this space depends on how compressible your files
are. To estimate the free space, DoubleSpace uses
the "estimated compression ratio"~HL87~.
Space used The amount of data stored on the compressed drive.
Total space An estimate of the drive's total capacity. This
number is the sum of the used and free space.
The Drive Info dialog box also shows information about the
"compressed volume file"~HL84~ that contains the compressed drive.
From the Compressed Drive Information dialog box, you can change the size or estimated compression ratio of the compressed drive. To change the drive's size, choose the Size button. To change its estimated compression ratio, choose the Ratio button.
Related Topics
--------------
"Changing the Size of a Drive"~HL78~
"Changing the Compression Ratio of a Drive"~HL77~
"Estimated Compression Ratio"~HL87~
"Listing the Drives on Your Computer"~HL93~
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Help -- Drive List
In the Drive List dialog box, DoubleSpace lists your computer's drives. It shows hard disk drives, RAM drives, floppy-disk drives and other removable-media drives. (The list does not include network drives.)
DoubleSpace shows the following information about each drive:
* Its drive letter.
* The type of drive it is, and whether or not it is compressed.
(DoubleSpace uses the term "removable-media drives" to refer to
floppy-disk drives as well as other types of removable-media
drives.)
* Its total capacity.
* The amount of free space it contains.
* The name of its compressed volume file, if it is a compressed
drive.
Related Topic
-------------
"Displaying Information About a Drive"~HL91~
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Help -- Change Size
In the Change Size dialog box, you can change the size of the selected compressed drive.
The Change Size dialog box shows information about the compressed
drive and the host drive -- the uncompressed drive that contains
the "compressed volume file"~HL84~ for the compressed drive.
To change the size of a compressed drive, you specify the amount of free space you want the uncompressed drive to contain.
Enlarging a Compressed Drive
----------------------------
You might want to enlarge a compressed drive if it is getting full. You can enlarge the compressed drive only if the host drive contains some free space. Enlarging a compressed drive makes more free space on it, but removes free space from the host drive.
To enlarge the compressed drive, specify a smaller amount of free space for the uncompressed drive.
Increasing the Free Space on the Uncompressed Drive
You might want to reduce the size of a compressed drive if you need more free space on the host drive. You can reduce the size of a compressed drive only if it contains free space.
To increase the amount of free space on the uncompressed drive, specify a larger amount of free space for the uncompressed drive.
Note: To reduce the size of a compressed drive as much as possible,
first run the MS-DOS Defragmenter, DEFRAG.EXE, on that drive.
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Help -- Change Compression Ratio
In the Change Compression Ratio dialog box, you can change the "estimated compression ratio"~HL87~ of a drive.
The estimated compression ratio is a number that DoubleSpace uses to calculate the amount of free space on a compressed drive. You might want to change this ratio if it differs greatly from the actual compressibility of the files you plan to store.
For example, you might want to specify a higher estimated compression ratio if you plan to store extremely compressible files such as bitmap files. You might want to specify a lower ratio if you will store files that will not compress much further, such as certain program (.EXE or .COM) files.
Note: Changing a drive's estimated compression ratio does not
affect how much DoubleSpace actually compresses the files
on that drive; it changes only the way DoubleSpace estimates
the free space on the compressed drive.
Having the wrong estimated compression ratio for your files can cause DoubleSpace to provide inaccurate space estimates to MS-DOS, which can, in turn, result in problems when storing files. If the ratio is too high, DoubleSpace overestimates the amount of free space; the DIR command might then report that more space is free than is actually available. If the ratio is too low, MS-DOS might be unable to copy a file even though there may be plenty of space for that file.
Note: To find out the actual compression ratio of each of your
existing files, type DIR /C at the command prompt.
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Help -- Mount a Compressed Drive
In the Mount a Compressed Drive dialog box, you can choose the drive you want to mount.
A compressed drive resides in the root directory of your disk as a hidden file with a filename such as DBLSPACE.001. This file is called a "compressed volume file"~HL84~ (CVF). When you mount a CVF, DoubleSpace associates it with a drive letter so you can use the files that CVF contains.
The Mount a Compressed Drive dialog box lists all the unmounted compressed volume files it finds on your computer. To mount one of them as a compressed drive, press the UP ARROW or DOWN ARROW keys to select it, and then choose OK or press ENTER.
Related Topics
-------------
"Unmounting a Compressed Drive"~HL98~
"Working with Floppy Disks"~HL89~
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Help -- Unmount Confirmation
In the Unmount Confirmation dialog box, you can confirm that you want to unmount a compressed drive. To confirm that you want to unmount the specified drive, choose OK.
Unmounting a compressed drive makes the files on it temporarily unavailable. To make the files available again, remount the drive by choosing the Mount command from the Drive menu.
An unmounted drive resides in the root directory of your disk as a "compressed volume file"~HL84~ -- a hidden file with a filename in the form DBLSPACE.nnn (for example, DBLSPACE.001).
CAUTION: Do not delete the compressed volume file. Doing so will
delete the compressed drive and all the files on it.
Related Topic
-------------
"Mounting an Unmounted Compressed Drive"~HL95~
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Help -- Format a Compressed Drive
In the Format a Compressed Drive dialog box, you can instruct DoubleSpace to format the specified drive.
CAUTION: If you format a compressed drive, all the files it
contains will be permanently erased. Formatting a
compressed drive erases its contents and leaves the empty
compressed volume file on your disk.
To format the selected drive, choose OK.
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Help -- Format Confirmation
You have just confirmed that you want to format the currently selected compressed drive.
This is the last chance you will have to confirm the Format command. To format the specified drive, choose Yes.
CAUTION: If you format a compressed drive, all the files it
contains will be permanently erased. Formatting a
compressed drive erases its contents and leaves the empty
compressed volume file on your disk.
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Help -- Delete a Compressed Drive
In the Delete a Compressed Drive dialog box, you can instruct DoubleSpace to permanently delete a compressed drive and its associated compressed volume file.
To delete the selected drive, choose OK.
CAUTION: When you delete a drive, you also delete all the files it
contains. Deleting a compressed drive removes the
compressed volume file from your disk.
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Help -- Delete Confirmation
You have just confirmed that you want to delete the currently selected compressed drive. This is the last chance you will have to confirm the deletion. To delete the drive, choose Yes.
CAUTION: When you delete a drive, you also delete all the files
it contains. Deleting a compressed drive removes the
compressed volume file from your disk.
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Help -- Defragment a Compressed Drive
In the Defragment a Compressed Drive dialog box, you can confirm that you want to defragment the specified drive. To defragment the selected drive, choose OK.
Defragmenting a compressed drive moves all the data to the beginning of the compressed volume file and all the free space to the end. Unlike defragmenting an uncompressed drive, it does not reorganize the files on the drive so that they are stored contiguously. Defragmenting a compressed drive has no effect on its speed.
You should defragment a compressed drive before you reduce its size. If you do, you might be able to reduce the drive's size more than you otherwise could.
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Help -- Chkdsk
In the Chkdsk dialog box, you can confirm that you want DoubleSpace to check the validity of the specified compressed drive.
* To have DoubleSpace check the drive's validity and attempt
to fix any errors it finds, choose the Fix button.
* To have DoubleSpace check the drive's validity but not fix
any errors, choose the Check button.
* To return to the main DoubleSpace screen without checking
the drive's validity, choose the Cancel button.
If you choose Fix or Check, DoubleSpace checks the internal structure of the compressed drive to ensure that it is free of errors. If DoubleSpace finds any errors, it reports them and, if you chose Fix, attempts to fix them.
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Help -- Options
In the DoubleSpace Options dialog box, you can set the following options, which determine how DoubleSpace interacts with your drives:
Last drive reserved for DoubleSpace's use
To mount a compressed drive, a drive letter must be available
to assign to DoubleSpace. DoubleSpace reserves some drive
letters based on the number of compressed drives you have.
If you run out of drive letters while compressing or mounting a
drive, increase this number. Each drive letter uses 24K of
memory; to conserve memory, decrease this number.
Number of removable-media drives
In general, you should set this field to the number of
removable-media drives you have. (Floppy-disk drives, Bernoulli
drives and Flash memory cards are all removable-media drives.)
You might want to specify fewer removable-media drives than you
actually have if you do not plan to compress the data in those
drives and you want to conserve memory.
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Help -- Using Help
Using the Help Window
---------------------
To scroll more Help information into view, use the following:
* The PAGE UP and PAGE DOWN keys
* The arrow keys
* The scroll bar to the right of the dialog box
To choose a button at the bottom of the Help window, press TAB or SHIFT+TAB until the button is selected, and then press ENTER. Or, use the mouse to click the button you want.
To close the Help window, press ESC or choose the Close button.
Viewing Help Topics
-------------------
Help displays related topics in a different color. To view a related topic, press TAB to select the topic you want, and then press ENTER. Or, use the mouse to click the topic name.
To select the previous topic name, press SHIFT+TAB.
Getting Instant Help
--------------------
To get instant help on a message or dialog box, press F1 or choose the Help button.
Using the Help Index
--------------------
To view an index of Help topics, choose the Index command from the Help menu.
To view the Help index from the Help window, press TAB to select the Index button, and then press ENTER. Or, click the Index button.
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Help -- About
The About dialog box displays the current version number of Microsoft DoubleSpace. To close the About dialog box, press ESC or choose OK.
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Help -- Incompatible Hardware or Software
This error message usually indicates that your computer is running disk-caching software that might be incompatible with DoubleSpace. This message also appears if your computer has a hardcard that is configured as drive C.
If You Are Running Incompatible Disk-Caching Software
If you run DoubleSpace while using incompatible disk-caching software, you could lose some or all of the files on your computer. Before running DoubleSpace, carry out the following procedure:
1. Edit your CONFIG.SYS and AUTOEXEC.BAT files and remove any
commands that start incompatible disk-caching software. (Microsoft
SMARTDrive is compatible with DoubleSpace, so you do not need to
remove commands that start SMARTDrive.) Save your changes to both
files.
2. Restart your computer by pressing CTRL+ALT+DEL.
3. Restart DoubleSpace.
For additional information, see the Troubleshooting DoubleSpace section of the README.TXT file.
If You Have a HardCard Drive Installed
--------------------------------------
If your computer includes a hardcard drive that is configured as drive C, DoubleSpace cannot compress that drive. However, DoubleSpace can compress your other drives, including other hardcard drives.
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Help -- Defragment Again?
DoubleSpace cannot continue the current operation because there is not enough contiguous free space on the drive you selected. DoubleSpace ran the Microsoft Defragmenter to try to gain more contiguous free space, but Defragmenter either did not finish or could not recover additional contiguous space.
* To have DoubleSpace run Defragmenter again, choose Yes.
You might want to run Defragmenter again if it was
accidentally interrupted, or if this is the first time
you have received this error message.
* If you have already answered Yes to this error message once,
or if you are sure Defragmenter was not interrupted, choose No.
Then, quit DoubleSpace and run CHKDSK /F on the drive.
When CHKDSK is complete, restart DoubleSpace and try carrying
out the operation (for example, resizing the drive) again.
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Help -- More Memory Required
DoubleSpace must allocate additional memory before it can create or mount additional compressed drives. To complete your task, do the following:
1. Restart your computer by choosing Yes.
2. After your computer starts, restart DoubleSpace.
3. Try carrying out your task again. (For example, if you were
trying to create a new compressed drive when you received this
message, you would choose the Create New command from the
Compress menu.)
To continue using DoubleSpace, choose No. You will return to the main DoubleSpace screen. However, you will not be able to complete your task until you have restarted your computer.
How DoubleSpace Allocates Memory for Drives
-------------------------------------------
Each time you start your computer, DoubleSpace allocates a certain amount of memory for mounting drives: 96 bytes of memory for each compressed drive that is currently mounted plus 96 bytes for each removable-media drive defined in the DoubleSpace Options dialog. When you create or mount additional drives, DoubleSpace uses up 96 bytes of memory for each drive.
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Help -- Restart Now?
DoubleSpace made some temporary changes to your AUTOEXEC.BAT file to ensure that DoubleSpace could restart if it was interrupted while resizing your compressed drive. DoubleSpace has restored your original AUTOEXEC.BAT and CONFIG.SYS files, but needs to restart your computer so that the settings in those files can take effect.
To restart your computer now, choose Yes.
To continue working with DoubleSpace, choose No. You will return to the main DoubleSpace screen. When you quit DoubleSpace, your computer will restart automatically.
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Help -- Retry
There is no disk in the drive you selected.
To continue, insert the disk in the drive, and then choose the Retry button.
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Help -- No Available Drive Letters
DoubleSpace cannot mount or compress any more drives because no more drive letters are available.
To make more drive letters available for DoubleSpace's use, choose the Options command from the Tools menu. Then, in the DoubleSpace Options dialog box, choose a higher drive letter in the "Last drive letter for DoubleSpace's use" box. Each drive letter uses 96 bytes of memory, so do not allocate more drive letters than you need.
You can also increase the number of available drive letters by unmounting compressed drives or by disconnecting network drives.
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Help -- Working with Your Startup Drive
DoubleSpace does not allow you to unmount, delete, or format your startup drive. If you were to unmount, delete, or format your startup drive, your computer would not start properly.
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Help -- Error Message
There are no unmounted drives on your computer.
You have chosen to mount a compressed drive. However, there are no unmounted compressed drives on your computer.
An unmounted drive appears on your disk as a hidden file with a filename in the form DBLSPACE.nnn (for example, DBLSPACE.001). This file is called a "compressed volume file"~HL84~. Once the file is mounted, it is available for use as a compressed drive, and any compressed files it contains become available.
If you previously unmounted a compressed drive and were trying to remount it when you received this error message, make sure that you did not accidentally delete the compressed volume file. (For a list of hidden files, type the DIR /AH command at the command prompt.)
If you suspect the compressed volume file has been deleted, try using the UNDELETE command to restore it. For more information, type HELP UNDELETE at the command prompt.
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Help -- DoubleSpace Found Correctable Errors on Your Drive
While checking the validity of your drive, DoubleSpace found an error that it can fix, such as a lost cluster or a damaged file signature.
To fix this error, choose Yes.
To skip this error and continue checking the drive, choose No.
To stop checking the drive, choose Cancel.
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Help -- DoubleSpace Found Serious Errors on Your Drive
While checking the validity of your drive, DoubleSpace found an error that it cannot fix.
To continue checking the drive, choose No.
To stop checking the drive, choose Cancel.
You might be able to fix this error by carrying out the CHKDSK /F command from the MS-DOS command prompt. To do this, quit DoubleSpace and then type CHKDSK /F at the command prompt. For more information, type HELP CHKDSK at the command prompt.
@@!hidMCHDKSKREPORT_DIALOG!@
Help -- Chkdsk Report
In this dialog, DoubleSpace reports any errors it found on your compressed drive.
If you chose the Fix button earlier, DoubleSpace fixed any errors it could. To fix errors that DoubleSpace was unable to fix, quit DoubleSpace and type the CHKDSK /F command at the MS-DOS command prompt. Or, try fixing the errors by using a disk-repair program.
If you chose the Check button earlier, DoubleSpace did not fix any of the errors it found and reported. To fix the errors, choose the Chkdsk command from the Tools menu. When DoubleSpace displays the Chkdsk dialog, choose the Fix button.
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Help -- Disk Errors Found
DoubleSpace has detected crosslinked files, lost clusters or other errors on the specified compressed drive.
To fix the errors, choose the Chkdsk command from the Tools menu. When DoubleSpace displays the Chkdsk dialog, choose the Fix button.
DoubleSpace will then examine the drive thoroughly for errors, and will fix as many errors as it can. When DoubleSpace finishes checking the validity of the drive and fixing errors, it displays a list of all the errors it found. If DoubleSpace could not fix some errors, try fixing them by carrying out the CHKDSK /F command from the MS-DOS command prompt.
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Help -- Remove Floppy Disk
Your startup floppy disk drive currently contains a floppy disk.
If the power fails or if your computer is accidentally restarted, DoubleSpace can recover automatically and continue compressing your drive. However, for DoubleSpace to continue properly, your computer must start from the hard disk rather than from a floppy disk.
Remove the floppy disk from the drive and then choose the Retry button.
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Help -- Invalid Free Space
The amount of free space you requested is invalid for one of the following reasons:
* The number you entered is too small or too large. The number
must be no smaller than the uncompressed drive's Minimum Free
Space value and no larger than the uncompressed drive's Maximum
Free Space value.
* The value you typed contains invalid characters. You must enter
a number. Do not use an additional character, such as a comma or
space, to separate thousands.
@@!77!@
Help -- Invalid Ratio
The ratio you requested is invalid for one of the following reasons:
* The ratio you entered is too small or too large. The number
must be within the range displayed in the Change Compression
Ratio dialog box.
* The value you typed contains invalid characters. You must enter
a number.
@@!78!@
Help -- File Access Error
DoubleSpace cannot continue because it is unable to find or gain access to the specified file.
If DoubleSpace was unable to find the file, the problem could be that the file is in a nonstandard location. If you know where this file is located, use the MS-DOS COPY command to copy the file from its current location to the directory that contains your MS-DOS files. Then, restart DoubleSpace and try your task again.
If DoubleSpace found the file but was unable to gain access to it, a disk error might be causing the problem. Try running CHKDSK /F to fix any disk errors. If CHKDSK is unable to fix the problem, try using a disk-repair program to fix it.
@@!79!@
Help -- Damaged Drive
Your computer was unexpectedly restarted, and now DoubleSpace is unable to remount the specified drive. This could be due to a disk error that damaged the drive's HOTLINK("compressed volume file",hlCVF).
To fix the error, quit DoubleSpace and then type CHKDSK /F at the MS-DOS command prompt. When CHKDSK completes, run DoubleSpace and try mounting the drive again.
@@!80!@
Help -- Error
DoubleSpace has encountered an error. For additional information, see the DoubleSpace section of the README.TXT file.
The README.TXT file is located in the directory that contains your MS-DOS files. (A copy of README.TXT is also located on Setup Disk 1.)
To view the README.TXT file, use a text editor such as MS-DOS Editor. For example, if your MS-DOS files are in the C:\DOS directory, you could view the README.TXT file by typing the following at the command prompt:
EDIT C:\DOS\README.TXT
@@!81!@
Help -- Drive is Full
DoubleSpace has compressed as many of the files on this drive as possible. However, there was not enough space to compress all the files. The files that were not compressed are still on the uncompressed drive, which now has a new drive letter.
To move those files to the compressed drive, you must move them to a different drive or onto a floppy disk, delete them from the uncompressed drive, enlarge the compressed drive, and then copy the files onto the compressed drive. For information about how to do this, see the README.TXT file.
@@!82!@
Help -- Startup Drive is Full
DoubleSpace Setup cannot continue because there is not enough space on your startup drive.
Use the DEL command to delete unnecessary files from your startup drive until there is enough space. To find out how much free space is on the drive, type the DIR command.
Caution: If you are not sure what a file's function is, do
not delete it. For a list of files you can safely
delete, see the Freeing Disk Space chapter of the
MS-DOS User's Guide.
@@!83!@
Help -- Cannot Find File
DoubleSpace cannot find the specified file.
To continue, quit DoubleSpace and make sure the file is located in the root directory of your startup disk or in the directory that contains your MS-DOS files. Then, restart DoubleSpace and try carrying out your task again.
@@!84!@
Help -- File Access Error
DoubleSpace cannot compress the specified file because it cannot gain access to it.
To try copying and compressing the file again, choose the Retry button.
To skip this file and continue with the compression process, choose the Skip button. When DoubleSpace finishes compressing your drive, the specified file will be located on the new uncompressed drive rather than on the compressed drive. To move the file to your compressed drive, carry out the CHKDSK /F command on the uncompressed drive, and then copy the file by using the MOVE or COPY commands.
@@!85!@
Help -- Disk Error
DoubleSpace cannot compress your drive because it has encountered a disk error.
After quitting DoubleSpace, carry out the CHKDSK /F command on this drive. If CHKDSK /F cannot fix the error, you might need to use a disk-repair program to fix the problem.
@@!86!@
Help -- No Compressible Drives
DoubleSpace could not find any compressible drives.
To compress a drive:
* The disk must be formatted.
* The drive must contain enough free space. To find out how
much free space is needed to compress a drive, exit
DoubleSpace and use the DBLSPACE /COMPRESS X: command,
where X is the letter of the drive you want to compress.
(DoubleSpace cannot compress 360K floppy disks.)
* If you are trying to compress a floppy disk or other
removable media, the disk must be in the drive and the
drive door closed.
@@!87!@
Help -- Cannot Load DBLSPACE.BIN
MS-DOS was unable to load DBLSPACE.BIN -- the part of MS-DOS that provides access to your compressed drives.
Either or both of the DBLSPACE.BIN and IO.SYS system files are invalid. Reinstall MS-DOS, and then try running DoubleSpace again.
@@!88!@
Help -- Quitting DoubleSpace
If you quit DoubleSpace Setup before it is complete, the files on your disk will be unchanged.
@@!92!@
Help -- Error
DoubleSpace has encountered a fatal error during compression.
For more information, see the DoubleSpace section of the README.TXT file. This file is located in the directory that contains your MS-DOS files. A copy of the README.TXT file is also located on Setup Disk 1.
@@!93!@
Help -- Error
DoubleSpace has encountered an error condition.
For more information, see the DoubleSpace section of the README.TXT file. This file is located in the directory that contains your MS-DOS files. A copy of the README.TXT file is also located on Setup Disk 1.
@@!94!@
Help -- Defragment Error
DoubleSpace has encountered an error while defragmenting your drive.
For more information, see the DoubleSpace section of the README.TXT file. This file is located in the directory that contains your MS-DOS files. A copy of the README.TXT file is also located on Setup Disk 1.
@@!95!@
Help -- Cannot Update Windows Files
The next time you run Windows, you will need to correct your Virtual Memory settings.
When DoubleSpace compressed your hard drive, it found that your Windows swap file was located on that drive. To work properly, your Windows swap file must be located on an uncompressed drive. Therefore, DoubleSpace moved your swap file to the specified uncompressed drive. However, DoubleSpace could not modify the Windows configuration files that specify the location of your swap file.
The next time you start Windows, you will see a message about your swap file. Follow the instructions on your screen.
@@!hidRUNDEFRAG_POPUP!@
Help -- Cannot Resize
DoubleSpace cannot resize your drive because it is too fragmented.
Quit DoubleSpace, and then run the Microsoft Defragmenter by typing DEFRAG at the command prompt. Then, start DoubleSpace and try again to resize the drive.
@@!96!@
Help -- Running DoubleSpace with Other Operating Systems
DoubleSpace has found files from another operating system on your hard disk. Before you install DoubleSpace, check to make sure the other operating system can use DoubleSpace compressed drives.
If you install DoubleSpace and the other operating system cannot read DoubleSpace compressed drives, then you will not be able to use the files on your compressed drives when you are running the other operating system.
If you compress drive C and the other operating system cannot read DoubleSpace compressed drives, the other operating system might not start properly.
@@!HL84!@
Help -- Compressed Volume File
A compressed drive is not a real disk drive, although it appears that way to most programs. Instead, a compressed drive exists on your disk as a hidden file called a compressed volume file (CVF). A compressed volume file is stored in the disk's root directory and has a filename in the form DBLSPACE.nnn. When you compress the files on an existing drive, DoubleSpace names the associated compressed volume file DBLSPACE.000. When you create a new compressed drive, DoubleSpace names the associated CVF by using a number such as 001 (for example, DBLSPACE.001).
Most CVFs can store more data than the space they use; for example, a typical CVF might use 10 MB of space on its host drive but contain 20 MB of compressed data. When a CVF is mounted, or made active, it is assigned a drive letter and appears as a disk drive. The CVF's contents are then accessible and appear as normal files.
Related Topic
-------------
"Mounting a Compressed Volume File"~HL95~
@@!HL92!@
Help -- Host Drive
A host drive is an uncompressed drive that contains one or more compressed volume files. Sometimes the host drive is referred to as the "physical drive" because it is an actual hard-disk partition or floppy disk.
After a drive is compressed, it becomes the host drive for a compressed volume file. The CVF contains the files that used to be on the host drive. Usually, the host drive contains very little free space after compression, since the compressed volume file uses so much space. Because it is compressed, a CVF can store more data than the space it uses; for example, a typical CVF might use 10 MB of space on the host drive but contain 20 MB of compressed data.
@@!HL87!@
Help -- Estimated Compression Ratio
The estimated compression ratio is a number that DoubleSpace uses to calculate the amount of free space on a compressed drive.
On an uncompressed drive, the free space indicates how much additional data you can store. However, on a compressed drive, the amount of data you can store depends on how compressible the files are. DoubleSpace estimates a drive's free space by assuming that you will store files that can be compressed to the estimated compression ratio.
You might want to change this ratio if it differs greatly from the actual compressibility of the files you plan to store.
For example, you might want to specify a higher estimated compression ratio if you plan to store extremely compressible files such as bitmap files. You might want to specify a lower ratio if you will store files that will not compress much further, such as certain program (.EXE or .COM) files.
Note: Changing a drive's estimated compression ratio does not
affect how much DoubleSpace actually compresses the files
on that drive; it changes only the way DoubleSpace estimates
the free space on the compressed drive.
Having the wrong estimated compression ratio for your files can cause DoubleSpace to provide inaccurate space estimates to MS-DOS, which can, in turn, result in problems when storing files. If the ratio is too high, DoubleSpace overestimates the amount of free space; the DIR command might then report that more space is free than is actually available. If the ratio is too low, MS-DOS might be unable to copy a file even though there may be plenty of space for that file.
Note: To find out the actual compression ratio of your existing
files, type the DIR /C command at the MS-DOS command prompt.
For more information, type HELP DIR at the command prompt.
Related Topic
-------------
"Changing the Compression Ratio of a Drive"~HL77~
@@!HL76!@
Help -- Working with Existing Compressed Drives
The main DoubleSpace screen lists all the compressed drives that are currently mounted.
To work with a compressed drive, first select it from the list by clicking it with the mouse, or by pressing the UP ARROW or DOWN ARROW keys until the drive is highlighted. Then choose the command you want to carry out from the Drive or Tools menu.
If there are more drives than fit in the window, you can scroll through the list by using the scroll bar on the right side of the list or by pressing the DOWN ARROW, UP ARROW, PAGE DOWN or PAGE UP keys.
You can carry out the following actions on a compressed drive you have selected:
"Display information about a drive"~HL91~
"Change the size of a drive"~HL78~
"Change the compression ratio of a drive"~HL77~
"Unmount a drive"~HL98~
"Format a drive"~HL90~
"Delete a drive"~HL86~
"Defragment a drive"~HL85~
"Check a drive's internal structure"~HL79~
You can also do the following:
"Mount an unmounted compressed drive"~HL95~
"Compress an existing drive"~HL80~
"Create a new compressed drive"~HL83~
@@!HL89!@
Help -- Using Floppy Disks
You can use DoubleSpace to increase the storage capacity of floppy disks as well as hard disks.
To compress a floppy disk, choose the Existing Drive command from the Compress menu.
In general, DoubleSpace treats compressed floppy disks just like compressed hard disks. However, there are a few differences:
* You must mount a compressed floppy disk before you can use it.
After you mount a compressed floppy disk, it remains mounted
until you remove the disk, replace it with a different disk, or
restart your computer. To mount a floppy disk, choose the Mount
command from the Drive menu.
* You cannot create a new empty compressed drive on a floppy
disk.
* When DoubleSpace compresses a floppy disk, it adds a file named
READTHIS.TXT to the disk. This file briefly describes how to
mount the compressed floppy disk so you can use the files it
contains.
Related Topics
--------------
"Compressing an Existing Drive"~HL80~
"Mounting an Unmounted Compressed Drive"~HL95~
@@!HL91!1!@
Help -- Displaying Information About a Drive
You can display information about a compressed drive by using any of the following methods:
* Select the drive in the main DoubleSpace screen, and then press
ENTER or choose the Info command from the Drive menu.
* Double-click the drive in the main DoubleSpace screen.
* From the MS-DOS command prompt, type the DBLSPACE /INFO command.
For more information, type HELP DBLSPACE /INFO at the command
prompt.
DoubleSpace provides the following information about the selected compressed drive:
* Its volume label
* The time and date it was created
* Its total capacity
* The amount of data stored on it
* An estimate of the amount of free space it contains
* Its actual compression ratio
* Its "estimated compression ratio"~HL87~
* The name of its "compressed volume file"~HL84~
* The size of its compressed volume file
@@!HL78!2!@
Help -- Changing the Size of a Drive
You can change the size of a compressed drive.
You might want to enlarge a compressed drive if it is getting full. You can enlarge the compressed drive only if the host drive contains some free space. Enlarging a compressed drive makes more free space on it, but removes free space from the host drive.
You might want to reduce the size of a compressed drive if you need more free space on the host drive. You can reduce the size of a compressed drive only if it contains free space.
To change the size of a compressed drive, select it in the main DoubleSpace screen, and then choose the Change Size command from the Drive menu.
You can also delete a compressed drive from the MS-DOS command prompt by using the DBLSPACE /SIZE command. For more information, type HELP DBLSPACE /SIZE at the command prompt.
@@!HL77!3!@
Help -- Changing the Compression Ratio of a Drive
The "estimated compression ratio"~HL87~ is a number that DoubleSpace uses to calculate the amount of free space on a compressed drive.
You might want to change a drive's estimated compression ratio if it differs greatly from the actual compressibility of the files you plan to store on that drive.
Note: Changing a drive's estimated compression ratio does not
affect how much DoubleSpace actually compresses the files
on that drive; it changes only the way DoubleSpace estimates
the free space on the compressed drive.
To change a drive's estimated compression ratio, select the drive in the main DoubleSpace screen, and then choose the Change Ratio command from the Drive menu.
You can also change a drive's estimated compression ratio from the MS-DOS command prompt by using the DBLSPACE /RATIO command. For more information, type HELP DBLSPACE /RATIO at the command prompt.
@@!HL98!5!@
Help -- Unmounting a Compressed Drive
You can instruct DoubleSpace to unmount a compressed drive. Unmounting a compressed drive makes the files on it temporarily unavailable. To make the files available again, remount the drive by choosing the Mount command from the Drive menu.
An unmounted drive resides in the root directory of your disk as a "compressed volume file"~HL84~ -- a hidden file with a filename in the form DBLSPACE.nnn (for example, DBLSPACE.001).
To unmount a compressed drive, select it in the main DoubleSpace screen, and then choose the Unmount command from the Drive menu.
You can also unmount a drive from the MS-DOS command prompt by using the DBLSPACE /UNMOUNT command. For more information, type HELP DBLSPACE /UNMOUNT at the command prompt.
Related Topic
-------------
"Mounting an Unmounted Compressed Drive"~HL95~
@@!HL90!6!@
HELP -- Formatting a Compressed Drive
You can instruct DoubleSpace to format a compressed drive. You might want to format a compressed drive if you have already backed up all the files on that drive and want to make the drive completely empty.
CAUTION: If you format a compressed drive, all the files it
contains will be permanently erased. Formatting a
compressed drive erases its contents and leaves the empty
compressed volume file on your disk.
To format a compressed drive, select it in the main DoubleSpace screen, and then choose the Format command from the Drive menu.
You can also format a compressed drive from the MS-DOS command prompt by using the DBLSPACE /FORMAT command. For more information, type HELP DBLSPACE /FORMAT at the command prompt.
@@!HL86!7!@
HELP -- Deleting a Compressed Drive
You can instruct DoubleSpace to permanently delete a compressed drive and its associated compressed volume file. You might want to delete a compressed drive if you have already backed up all the files on that drive and want to reclaim the space used by the compressed volume file on the host drive.
CAUTION: When you delete a drive, you also delete all the files it
contains. Deleting a compressed drive removes the
compressed volume file from your disk.
To delete a compressed drive, select it in the main DoubleSpace screen, and then choose the Delete command from the Drive menu.
You can also delete a compressed drive from the MS-DOS command prompt by using the DBLSPACE /DELETE command. For more information, type HELP DBLSPACE /DELETE at the command prompt.
@@!HL88!8!@
HELP -- Quitting DoubleSpace
To quit the DoubleSpace program, choose the Exit command from the Drive menu.
Note: If you mounted any compressed floppy disks or removable-media
drives, they will remain mounted until you unmount them or
restart your computer.
@@!HL85!11!@
HELP -- Defragmenting a Compressed Drive
You can instruct DoubleSpace to defragment a compressed drive. Defragmenting a compressed drive moves all the data to the beginning of the compressed volume file and all the free space to the end. Unlike defragmenting an uncompressed drive, it does not reorganize the files on the drive so that they are stored contiguously. Defragmenting a compressed drive has no effect on its speed.
You should defragment a compressed drive before you reduce its size. If you do, you might be able to reduce the drive's size more than you otherwise could.
To defragment a compressed drive, select it in the main DoubleSpace screen, and then choose the Defragment command from the Drive menu.
You can also defragment a compressed drive from the MS-DOS command prompt by using the DBLSPACE /DEFRAG command. For more information, type HELP DBLSPACE /DEFRAG at the command prompt.
@@!HL79!13!@
HELP -- Checking a Compressed Drive's Internal Structure
You can instruct DoubleSpace to check the internal validity of a compressed drive.
When DoubleSpace checks the internal structure of a compressed drive, it checks the drive's DoubleSpace data tables. If DoubleSpace finds any errors, it reports them and attempts to fix them.
Note: DoubleSpace Chkdsk does not check the MS-DOS file allocation
tables; to check these, carry out the CHKDSK command from the
MS-DOS prompt.
To check the internal validity of a compressed drive, select the drive in the main DoubleSpace screen, and then choose the Chkdsk command from the Tools menu.
You can also check the internal validity of a compressed drive from the MS-DOS command prompt by using the DBLSPACE /CHKDSK command. For more information, type HELP DBLSPACE /CHKDSK at the command prompt.
@@!HL93!@
HELP -- Listing Your Computer's Drives
You can have DoubleSpace display a list of your computer's drives.
To do this, quit DoubleSpace and type the DBLSPACE /LIST command at the MS-DOS command prompt.
DoubleSpace lists your computer's hard disk drives, RAM drives, floppy-disk drives and other removable-media drives. (It does not list network drives.) DoubleSpace shows the following information about each drive:
* Its drive letter.
* The kind of drive it is, and whether or not it is compressed.
(DoubleSpace uses the term "removable-media drives" to refer to
floppy-disk drives as well as other types of removable-media
drives.)
* Its total capacity.
* The amount of free space it contains.
* The name of its compressed volume file, if it is a compressed
drive.
For more information about the DBLSPACE /LIST command, type HELP DBLSPACE /LIST at the command prompt.
@@!HL95!4!@
HELP -- Mounting a Compressed Drive
A compressed drive is actually just a compressed volume file until you mount it. Mounting a compressed volume file establishes a connection between it and a drive letter, so that you can use that CVF as a drive.
Mounting is especially important for compressed floppy disks, since DoubleSpace automatically unmounts compressed floppy-disk drives whenever you change disks or restart your computer.
To mount a compressed volume file, choose the Mount command from the Drive menu, and then select the compressed volume file from the list that DoubleSpace displays.
You can also mount a compressed volume file from the MS-DOS command prompt by using the DBLSPACE /MOUNT command. For more information, type HELP DBLSPACE /MOUNT at the command prompt.
Related Topics
--------------
"Unmounting a Compressed Drive"~HL98~
"Working with Floppy Disks"~HL89~
@@!HL80!9!@
HELP -- Compressing an Existing Drive
When you compress an existing drive, you compress all the files on it. When compression is complete, your original drive will contain compressed files and additional free space. You will also have a new uncompressed drive that contains any uncompressible files from the drive you just compressed.
To compress an existing drive, choose the Existing Drive option from the Compress menu.
You can also compress an existing drive from the MS-DOS command prompt by using the DBLSPACE /COMPRESS command. For more information, type HELP DBLSPACE /COMPRESS at the command prompt.
Related Topics
--------------
"Creating a New Compressed Drive"~HL83~
"Working with Floppy Disks"~HL89~
@@!HL83!10!@
HELP -- Creating a New Compressed Drive
You can create a new compressed drive by using free space on an existing uncompressed drive. When compression is complete, you will have a new compressed drive that contains more free space than it took from the existing drive.
To create a new compressed drive, choose the Create New Drive option from the Compress menu.
You can also create a new compressed drive from the MS-DOS command prompt by using the DBLSPACE /CREATE command. For more information, type HELP DBLSPACE /CREATE at the command prompt.
Related Topic
-------------
"Compressing an Existing Drive"~HL80~
@@!HL96!15!@
Help -- Options
You can set options that determine how DoubleSpace reserves memory for use when mounting additional drives. To do this, choose the Options command from the Tools menu. The Options dialog box appears, and contains the following options:
Last drive reserved for DoubleSpace's use
To mount a compressed drive, a drive letter must be available
to assign to DoubleSpace. DoubleSpace reserves some drive
letters based on the number of compressed drives you have.
If you run out of drive letters while compressing or mounting a
drive, increase this number. Each drive letter uses 96 bytes of
memory; to conserve memory, decrease this number.
Number of removable-media drives
In general, you should set this field to the number of
removable-media drives you have. (Floppy-disk drives, Bernoulli
drives and Flash memory cards are all removable-media drives.)
You might want to specify fewer removable-media drives than you
actually have if you do not plan to compress the data in those
drives and you want to conserve memory.
@@!HL72!@
HELP -- An Overview of DoubleSpace
DoubleSpace is a disk-compression program. Disk compression makes it possible to store more data on a disk than you ordinarily could. Typically, you can store twice as much data on a compressed disk as you could on a disk that is not compressed.
To set up DoubleSpace on your computer, you (or someone else) typed DBLSPACE at the command prompt. The DoubleSpace Setup program configured MS-DOS to provide access to compressed drives, and then compressed the specified hard disk drive.
Now that your computer contains one or more compressed drives, you can use this program -- the DoubleSpace maintenance program -- to maintain your existing compressed drives or to create new compressed drives.
You can also maintain or create compressed drives by typing DoubleSpace commands at the MS-DOS command prompt. For more information, type HELP DBLSPACE at the command prompt.
Related Topics
--------------
"Using DoubleSpace Help"~HL99~
"Using DoubleSpace Menus"~HL73~
"Using the Main DoubleSpace Screen"~HL97~
"Using DoubleSpace With Floppy Disks"~HL89~
"Understanding DoubleSpace Concepts"~HL81~
@@!HL74!@
Help -- Using the DBLSPACE.INI File
The DBLSPACE.INI file is a text file with the Read-Only and Hidden attributes. DoubleSpace stores this file in the root directory of your startup drive. The DBLSPACE.INI file contains variables that DoubleSpace uses when your computer starts. Although it is possible to change these variables yourself, you should do so only if you understand what they do and what the results might be. Before changing the DBLSPACE.INI file, you should make a backup copy of the file.
The DBLSPACE.INI file can contain one or more of the following variables:
MaxRemovableDrives=n
Specifies how many additional drives DoubleSpace should
allocate memory for when your computer starts. DoubleSpace
allocates 96 bytes of memory for each additional drive.
The MaxRemovableDrives variable determines how many additional
compressed drives you can create or mount without restarting
your computer.
FirstDrive=X
Set by DoubleSpace each time it modifies the DBLSPACE.INI file.
Do not change the FirstDrive variable yourself.
LastDrive=Y
Specifies the highest drive letter available for use by
DoubleSpace. (If another program uses one of the drive
letters specified for DoubleSpace, the highest drive letter
available to DoubleSpace will be higher than the LastDrive
variable.)
MaxFileFragments=n
Set by DoubleSpace to specify the degree of fragmentation to
allow in all mounted compressed volume files. Do not change
the MaxFileFragments variable yourself.
ActivateDrive=X,Yn
Specifies a compressed volume file that DoubleSpace should
mount automatically when your computer starts. The
ActivateDrive variable requires the following parameters:
X The drive letter to assign to the newly mounted
compressed drive.
Y The drive letter of the "host drive"~HL92~.
n The number of the "compressed volume file"~HL84~.
To determine the CVF number, examine its filename extension.
If the CVF filename is DBLSPACE.000, set n to 0; if the
CVF filename is DBLSPACE.001, set n to 1, and so on.
The DBLSPACE.INI file can contain than one ActivateDrive variable.
@@!HL75!@
Help -- Understanding DoubleSpace and Memory
DBLSPACE.BIN Provides Access to Compressed Drives
-------------------------------------------------
When you start your computer, MS-DOS loads DBLSPACE.BIN into memory. DBLSPACE.BIN is the part of MS-DOS that provides access to your compressed drives. It requires about 40K of memory. MS-DOS loads DBLSPACE.BIN along with other operating system functions, before carrying out the commands in your CONFIG.SYS and AUTOEXEC.BAT files. Initially, DBLSPACE.BIN loads at the top of conventional memory.
DBLSPACE.SYS Determines the Memory Location of DBLSPACE.BIN
When MS-DOS carries out the commands in your CONFIG.SYS file, it loads the DBLSPACE.SYS device driver, which moves DBLSPACE.BIN from the top of conventional memory to its final location in memory. (DoubleSpace Setup automatically adds a DEVICE command for the DBLSPACE.SYS device driver to your CONFIG.SYS file. This device driver does not provide access to compressed drives; it simply determines the final location in memory of DBLSPACE.BIN.)
There are two reasons you might want to move DBLSPACE.BIN from the top of conventional memory:
* To avoid conflicts with programs that require access to the
top of conventional memory. A few programs require access to
the top of conventional memory and do not work properly if
DBLSPACE.BIN is located there. To avoid any possible conflicts
with such programs, DoubleSpace Setup automatically configures
the DEVICE command for DBLSPACE.SYS to move DBLSPACE.BIN from
the top of conventional memory to the bottom.
* To free conventional memory. If you have an 80386 or 80486
computer with extended memory, you can free some conventional
memory by moving DBLSPACE.BIN from conventional to upper memory.
To move DBLSPACE.BIN to the high memory area, if available, run
the MemMaker program. (For information about how to run MemMaker,
see the Making More Memory Available chapter in the MS-DOS
Users Guide.) If there is enough upper memory to accommodate
DBLSPACE.BIN, MemMaker changes the DEVICE command for
DBLSPACE.SYS to a DEVICEHIGH command, and MS-DOS moves
DBLSPACE.BIN to upper memory. If there is not enough upper
memory for DBLSPACE.BIN, MemMaker leaves the DEVICE command for
DBLSPACE.SYS unchanged.
For more information about DBLSPACE.SYS and DBLSPACE.BIN, type HELP DBLSPACE.SYS at the MS-DOS command prompt.
How DoubleSpace Allocates Memory for Drives
-------------------------------------------
Each time you start your computer, DoubleSpace allocates a certain amount of memory for mounting drives: 96 bytes of memory for each compressed drive that is currently mounted plus 96 bytes for each removable-media drive defined in the DoubleSpace Options dialog. When you create or mount additional drives, DoubleSpace uses up 96 bytes of memory for each drive.
To change the amount of memory DoubleSpace allocates, choose the Options command from the Drive menu and specify a different number of removable-media drives.
@@!HL73!19!20!21!16!17!22!@
HELP -- Using DoubleSpace Menus
DoubleSpace lists commands in menus at the top of the main DoubleSpace screen.
To select a menu command by using the keyboard:
1. Display the menu you want by pressing the ALT key and the first
letter of the menu name.
2. Press the UP ARROW or DOWN ARROW key until the command you want
is highlighted.
3. Press the ENTER key to select the highlighted command.
To select a menu command by using the mouse:
1. Click the name of the menu that contains the command you want.
2. Click the name of the command.
For more information about DoubleSpace menu commands, choose one of the following topics:
Drive Menu
"Info command"~HL91~
"Change Size command"~HL78~
"Change Ratio command"~HL77~
"Mount command"~HL95~
"Unmount command"~HL98~
"Format command"~HL90~
"Delete command"~HL86~
"Exit command"~HL88~
Compress Menu
"Existing Drive command"~HL80~
"Create New Drive command"~HL83~
Tools Menu
"Defragment command"~HL85~
"Chkdsk command"~HL79~
"Options command"~HL96~
The Help menu contains the Contents and Index commands, which display the Help Contents and Help Index screens. It also contains the About command, which displays the version number of DoubleSpace. For more information about using Help, press F1 now.
@@!HL81!@
HELP -- Understanding DoubleSpace Concepts and Terms
To learn more about DoubleSpace concepts and terms, choose one of the following topics:
"Compressed Volume File"~HL84~
"Estimated Compression Ratio"~HL87~
"Host Drive"~HL92~
"Working With Compressed Drives"~HL76~
"Working With Floppy Disks"~HL89~
@@!IDX!@
Help Index
To display a help topic, double-click the topic name. Or, select the topic name and then press ENTER. For more information about using DoubleSpace Help, press F1.
Using the DoubleSpace Program
-----------------------------
"An Overview of the DoubleSpace Program"~HL72~
"Using DoubleSpace Menus"~HL73~
"Using the Main DoubleSpace Screen"~HL97~
"Using DoubleSpace Help"~HL99~
Working With Compressed Drives
------------------------------
"Changing a Drive's Estimated Compression Ratio"~HL77~
"Changing the Size of a Compressed Drive"~HL78~
"Creating a Compressed Drive by Compressing Free Space"~HL83~
"Defragmenting a Compressed Drive"~HL85~
"Deleting a Compressed Drive"~HL86~
"Displaying Information About a Compressed Drive"~HL91~
"Formatting a Compressed Drive"~HL90~
"Listing all the Drives on Your Computer"~HL93~
"Mounting a Compressed Drive"~HL95~
"Unmounting a Compressed Drive"~HL98~
"Working with Compressed Drives"~HL76~
Adding More Compressed Drives
-----------------------------
"Compressing an Existing Drive"~HL80~
"Creating a New Compressed Drive"~HL83~
"Compressing a Floppy Disk"~HL89~
Other Topics
------------
"Understanding DoubleSpace Concepts And Terms"~HL81~
"Using the DBLSPACE.INI File"~HL74~
"Using DoubleSpace with Floppy Disks"~HL89~
"Changing DoubleSpace Options"~HL96~
"Understanding DoubleSpace and Memory"~HL75~
For additional information about DoubleSpace, see the Freeing Disk Space chapter in the MS-DOS User's Guide or the DoubleSpace section of the README.TXT file.
