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README.TXT NOTES ON MS-DOS 6.2 =================== This file provides important information not included in the MICROSOFT MS-DOS 6 USER'S GUIDE or in MS-DOS Help. This file is divided into the following major sections: 1. Setup 2. MemMaker, EMM386, and Memory Management 3. Windows 4. Hardware Compatibility with MS-DOS 6.2 5. Microsoft Programs 6. Third-Party Programs 7. DoubleSpace If the subject you need information about doesn't appear in this file, you might find it in one of the following text files included with MS-DOS: * OS2.TXT, which describes how to remove and save data on your computer when you replace OS/2 with MS-DOS 6.2. * NETWORKS.TXT, which describes how to update your network software for use with MS-DOS 6.2. For information about features new to MS-DOS 6.2, type HELP WHATSNEW at the command prompt. This file contains the following topics: 1. Setup 1.1 SpeedStor 1.2 Incompatible Hard Disk or Device Driver 1.3 AT&T 6300 Computer 1.4 Toshiba with a Hard RAM Disk 1.5 Tandy with ROM DOS 1.6 Setup displays the "Your computer uses a disk-compression program that is incompatible with Setup" message. 1.7 You deleted files from the directory that Setup needs to install the optional Windows programs. 1.8 Running Setup if Your Computer Uses Windows NT 1.9 Setup detects that your computer has a non-MS-DOS partition or non-MS-DOS files, and your computer uses Windows NT. 1.10 Setup displays the "Your computer uses password protection" screen. 1.11 Setup displays the "Your computer is using an incompatible delete-protection program" screen. 1.12 Setup detects that your computer uses DR DOS. 1.13 Installing MS-DOS on a Drive Other Than C 1.14 Bypassing the Uninstall Disk and Using Default Setup Options 1.15 Installing MS-DOS 6.2 on a System with a CorelSCSI UNI_ASP.SYS Driver 1.16 Installing MS-DOS 6.2 if you have DrivePro or EZ-Drive 1.17 Additional Keyboard and Codepage Support 2. MemMaker, EMM386, and Memory Management 2.1 Intel Expanded-Memory Driver (EMM.SYS) 2.2 Running MemMaker on a Computer with PC-NFS 2.3 You have a Super VGA display and want to conserve memory. 2.4 Using MemMaker with IBM LAN 2.5 MemMaker and Adaptec SCSI devices 2.6 Running MemMaker on a computer with PC Tools RAMBoost 2.7 EMM386 detects an error in an application 3. Windows 3.1 Your computer uses a Windows 3.0 permanent swap file. 4. Hardware Compatibility with MS-DOS 6.2 4.1 Compaq EXTDISK.SYS Driver 4.2 Hardcard 4.3 Toshiba 5. Microsoft Programs 5.1 Microsoft Anti-Virus 5.2 Running Microsoft Backup for MS-DOS under Windows 5.3 Backup for Windows stops running at the end of the compatibility test 5.4 Running Microsoft Backup with TI4000 and Gateway NOMAD computers 5.5 Microsoft Defragmenter 6. Third-party Programs 6.1 4DOS and NDOS 6.2 Above Board 286 and Above Board Plus Installation Programs 6.3 CodeView 6.4 Colorado Tape Backup 6.5 Fastback Plus 6.6 Norton Desktop for Windows 2.0 6.7 Norton Utilities 6.8 PC Tools 6.9 QEMM 7.01 6.10 Johnson Computer Systems PC-Vault and PC-Vault Plus 6.11 AddStor DoubleTools 7. DoubleSpace 7.1 Converting Your XtraDrive Disk-Compression Software to DoubleSpace 7.2 Converting Stacker 2.x or 3.0 Software to DoubleSpace 7.3 Converting Stacker 3.1 Software to DoubleSpace 7.4 Converting Other Disk-Compression Software to DoubleSpace 7.5 DoubleSpace Setup indicates that your computer is running an incompatible disk-caching program. 7.6 Your compressed drive runs out of disk space. 7.7 Your uncompressed (host) drive runs out of disk space. 7.8 DoubleSpace did not compress all of your files because the drive ran out of disk space. 7.9 Windows displays the message "The permanent swap file is corrupt." 7.10 EXTDISK.SYS displays a warning about drive letters. 7.11 You need a special device driver to use your startup drive. 7.12 Defragmenting uncompressed drives after changing file attributes 7.13 Files DoubleSpace cannot compress 7.14 Microsoft Defragmenter runs out of memory while you are compressing a drive. 7.15 DoubleSpace and PC-Vault 7.16 Maximum size of a compressed drive 7.17 DoubleSpace could not mount a drive due to problems with the drive 7.18 DoubleSpace finishes installation, but you cannot access your Hardcard. 7.19 You receive a DoubleGuard Alarm message 7.20 A compressed drive is currently too fragmented to mount 7.21 DoubleSpace displays the message "Your computer is running with an incompatible version of DBLSPACE.BIN" 7.22 Using the DBLSPACE command after bypassing DBLSPACE.BIN 7.23 Removing the write-protection from a compressed floppy disk 7.24 Automounting and Norton Disk Cache 1. SETUP ======== 1.1 SpeedStor ------------- If you have a SpeedStor partition on your computer, Setup probably referred you to this section for one of the following reasons: * Setup could not find in your CONFIG.SYS file a command for the device driver that supports your SpeedStor partition. If this is the case, add the command line to your CONFIG.SYS file, restart your computer, and run Setup. For more information about adding the command line to your CONFIG.SYS file, see your SpeedStor documentation. * Your CONFIG.SYS file has a DEVICE=HARDRIVE.SYS line in it. If this is the case, carry out the following procedure: 1. Use the EXPAND command to expand and copy the SSTOR.SYS file to your hard disk. Make sure you copy the SSTOR.SYS file to the same path as the HARDRIVE.SYS file. See the PACKING.LST file on Setup Disk 1 for the location of the SSTOR.SYS file on the Setup disks and for instructions on how to expand and copy it to your hard disk. 2. Replace the DEVICE=HARDRIVE.SYS command with a DEVICE=SSTOR.SYS command. For example, if the command that loaded the HARDRIVE.SYS file was DEVICE=C:\SSTOR\HARDRIVE.SYS, you would replace it with DEVICE=C:\SSTOR\SSTOR.SYS. 3. Restart your computer. 4. Make sure you can access your hard disk. 5. Run Setup. 1.2 Incompatible Hard Disk or Device Driver ------------------------------------------- If Setup referred you to this section, and no other section in this file is relevant to your system, you have a partition that is incompatible with MS-DOS 6.2. You must delete the partition from your hard disk. See "Using Fdisk to Configure Your Hard Disk" in the chapter "Diagnosing and Solving Problems" in the MICROSOFT MS-DOS 6 USER'S GUIDE. 1.3 AT&T 6300 Computer ---------------------- If you use an AT&T 6300 computer and your ROM BIOS is version 1.21, contact your vendor for a ROM BIOS upgrade. The ROM BIOS version number is displayed when you start your computer. 1.4 Toshiba with a Hard RAM Disk -------------------------------- These instructions apply to Toshiba models T1200, T1600, T1200XE and T1000LE. To use the hard RAM disk, carry out the following procedure before you install MS-DOS 6.2: 1. Back up your hard RAM disk. 2. Using the Toshiba Setup program, delete the hard RAM disk by allocating zero kilobytes (KB) to it. All data on the hard RAM disk will be lost. 3. Restart your computer 4. Run MS-DOS 6.2 Setup. 5. After Setup is complete, run the Toshiba Setup program to reinstall the hard RAM disk. 6. Run FDISK, change to drive 2, and create a primary DOS partition. Quit FDISK. 7. Use the FORMAT command to format drive D. 1.5 Tandy with ROM DOS ---------------------- Contact your hardware manufacturer for information about upgrading a Tandy computer with ROM DOS to MS-DOS 6.2. This applies to the following models: 1000EX, 1000HX, 1000SL, 1000SL2, 1000TL, 1000TL2, 1000TL3, 1000RL, 1000RLX, 1000RL-HD, 1000RLX-HD, 1100FD, 2500XL, 2500XL2. 1.6 Setup displays the "Your computer uses a disk-compression program that is incompatible with Setup" message. -------------------------------------------------------------- If Setup indicated that your computer has an incompatible disk-compression program, you must remove it manually before you can install MS-DOS 6.2. Carry out the following procedure. NOTE This procedure will replace your current disk-compression software with DoubleSpace. As an alternative, contact your disk- compression vendor for an updated version of your software. In most cases, current versions of disk-compression software are compatible with MS-DOS 6.2. 1. Back up all the files on your compressed drive. In step 3, you will format your uncompressed drive, which destroys all the files on your compressed and uncompressed drives. 2. If your Setup disks are compatible with drive A, insert Setup Disk 1 in drive A, and restart your computer. After Setup displays the first screen, quit Setup by pressing F3 twice. If your Setup disks are not compatible with drive A, create a startup floppy disk for drive A. To do this, insert Setup Disk 1 in drive B, and a blank floppy disk in drive A. Then type B:SETUP /F at the command prompt. When prompted, choose to install MS-DOS on the floppy disk in drive A. After Setup is finished, leave the disk in drive A, and restart your computer. 3. At the command prompt, type FORMAT C: /S to reformat your startup drive and transfer MS-DOS 6.2 system files to it. 4. Remove the disk from drive A, and restart your computer. 5. Insert Setup Disk 1 in drive A or B, and type A:SETUP or B:SETUP at the command prompt. 6. After Setup is complete, type DBLSPACE at the command prompt, and follow the instructions on your screen. For more information about DoubleSpace, see the chapter "Freeing Disk Space" in the MICROSOFT MS-DOS 6 USER'S GUIDE. 7. After you have installed DoubleSpace, restore the files you backed up. Do not restore older versions of MS-DOS files. 1.7 You deleted files from the directory that Setup needs to install the optional Windows programs. --------------------------------------------------------- If you typed BUSETUP /E at the command prompt, the "Setup did not find the files it needs in the directory specified" message appeared, and you think you deleted the files from your hard disk, insert Setup Disk 1 in drive A or B, and start Setup by typing A:SETUP /E or B:SETUP /E at the command prompt. 1.8 Running Setup if Your Computer Uses Windows NT -------------------------------------------------- If your computer has Windows NT, but not MS-DOS installed on it, carry out Procedure 1. If your computer has Windows NT and MS-DOS installed on it, carry out Procedure 2. Procedure 1 o Run Setup by inserting Setup Disk 1 in drive A, and restarting your computer. NOTE Windows NT will be disabled after Setup. If Windows NT was installed on a FAT partition, and you want to reenable it, re-install Windows NT so you can use both the Windows NT and MS-DOS operating systems. If Windows NT was installed on a non-FAT partition, see section 1.9. Procedure 2 1. When you start your computer, choose MS-DOS as your operating system. 2. Run Setup by inserting Setup Disk 1 in drive A or B, and typing A:SETUP or B:SETUP at the command prompt. 1.9 Setup detects that your computer has a non-MS-DOS partition or non-MS-DOS files, and your computer uses Windows NT ---------------------------------------------------------- The procedure you use depends on whether you want to preserve the partition and its files. Find the section below that describes the configuration you want. You Don't Want to Preserve the Partition or its Files ------------------------------------------------------ If you don't want to preserve the partition or its files, choose to remove the partition or files if Setup prompts you to do so. If Setup doesn't offer you that choice, remove the partition manually after Setup is complete. For instructions on removing a non-MS-DOS partition manually, see "Using Fdisk to Configure Your Hard Disk" in the chapter "Diagnosing and Solving Problems" in the MICROSOFT MS-DOS 6 USER'S GUIDE. You Don't Want to Preserve the Partition but Want to Save its Files ------------------------------------------------------------------- If you want to save the data files, but don't want to preserve the partition, back up the files, run Setup again, and then choose to remove the partition or files if Setup prompts you to do so. If Setup doesn't offer you this choice, remove the partition manually after Setup is complete. For instructions on removing the partition manually, see "Using Fdisk to Configure Your Hard Disk" in the chapter "Diagnosing and Solving Problems" in the MICROSOFT MS-DOS 6 USER'S GUIDE. You Want to Preserve the Partition and Its Files ------------------------------------------------ Carry out the following procedure. NOTE If the non-MS-DOS partition takes up all the space on your hard disk, you must reconfigure your hard disk. You can either let Setup do it for you, as described in the preceding section, or reconfigure it yourself manually. For instructions on reconfiguring your hard disk manually, see your Windows NT documentation. To install MS-DOS 6.2 and preserve your partition or files: 1. Run MS-DOS Setup. 2. When prompted, choose to continue Setup without removing the partition or files. 3. After Setup is complete, re-install Windows NT. Windows NT will configure your system to allow using either the MS-DOS and Windows NT operating systems. 1.10 Setup displays the "Your computer uses password protection" screen. ---------------------------------------------------------------- See section 1.12. 1.11 Setup displays the "Your computer is using an incompatible delete-protection program" screen. --------------------------------------------------------------- See section 1.12. 1.12 Setup detects that your computer uses DR DOS. -------------------------------------------------- If you have DR DOS installed on your computer, take the following precautions before restarting Setup: o If your system has any security features, including password protection, disable them. For more information, see "Setup displays the 'Your computer uses password protection' screen" in the chapter "Diagnosing and Solving Problems" in the MICROSOFT MS-DOS 6 USER'S GUIDE. If you have protected any files or directories with a password, remove the password protection, particularly if you have protected your CONFIG.SYS or AUTOEXEC.BAT files, or your DR DOS directory. o If you have DELWATCH installed on your computer, carry out the procedure "Setup displays the 'Your computer is using an incompatible delete-protection program' screen" in the chapter "Diagnosing and Solving Problems" in the MICROSOFT MS-DOS 6 USER'S GUIDE. o If your CONFIG.SYS or AUTOEXEC.BAT files use any conditional commands-- such as the "?" or GOTO commands--remove them and adjust the order of commands in your startup files accordingly. o If your CONFIG.SYS file uses the CHAIN command, remove it and adjust the order of commands in the file accordingly. o If your computer uses disk compression, but drive C is not compressed, run Setup as described in the chapter "Getting Started" in the MICROSOFT MS-DOS 6 USER'S GUIDE. When Setup displays the "Your CONFIG.SYS file contains commands that are not valid MS-DOS commands" message, choose the "Modify original files" option. If drive C is compressed, carry out the following procedure: 1. Determine which drive is your original uncompressed drive. For more information, see your DR DOS documentation. 2. Make backup copies of the CONFIG.SYS and AUTOEXEC.BAT files on your compressed drive, and the DCONFIG.SYS file on your uncompressed drive. 3. Combine the two configuration files. For example, if drive D is your uncompressed drive, type the following at the command prompt: COPY D:\DCONFIG.SYS+C:\CONFIG.SYS D:\CONFIG.SYS 4. Copy the combined CONFIG.SYS file to drive C. For example, if drive D is your uncompressed drive, type the following at the command prompt: COPY D:\CONFIG.SYS C:\CONFIG.SYS 5. Copy your AUTOEXEC.BAT to your uncompressed drive. For example, if drive D is your uncompressed drive, type the following at the command prompt: COPY C:\AUTOEXEC.BAT D:\AUTOEXEC.BAT 6. Run MS-DOS 6.2 Setup. 7. When Setup displays the "Your CONFIG.SYS file contains commands that are not valid MS-DOS commands" message, choose the "Modify original files" option. When Setup displays the "Because you are currently using the DR DOS operating system" message, choose Continue. 8. After Setup is complete, MS-DOS displays an "Unrecognized command" message on your screen for each command in your AUTOEXEC.BAT and CONFIG.SYS files that is not a valid MS-DOS command. Remove these commands from your CONFIG.SYS and AUTOEXEC.BAT files. 9. Add the DEVICE=HIMEM.SYS command to the beginning of your CONFIG.SYS file, and the restart your computer. 1.13 Installing MS-DOS on a Drive Other Than C ---------------------------------------------- As described in the following procedure, you can install MS-DOS on a drive other than C by using the /M switch to copy the system files to your startup drive and then using the /Q switch to copy your MS-DOS files to a different drive. NOTE This procedure is designed for advanced users. If your computer uses disk-compression software, modify the procedure as appropriate. NOTE If your computer uses disk-partitioning software, such as Disk Manager, SpeedStor, Priam, or Everex, do not carry out the procedure until you have carried out steps 1 through 3 of "You need to install MS-DOS manually" in the chapter "Diagnosing and Solving Problems" in the MICROSOFT MS-DOS 6 USER'S GUIDE. If your software uses a driver to enable the drive on which you want to install MS-DOS, make sure you create a startup disk with the driver in a CONFIG.SYS or AUTOEXEC.BAT file. After you have carried out these steps, skip to step 3 of the following procedure. 1. Run Setup by inserting Setup Disk 1 in drive A or B, and typing A:SETUP /M or B:SETUP /M at the command prompt. NOTE Your CONFIG.SYS and AUTOEXEC.BAT files were saved as CONFIG.NEW and AUTOEXEC.NEW. 2. Run Setup by inserting Setup Disk 1 in drive A or B, and typing A:SETUP /Q or B:SETUP /Q at the command prompt. Follow the instructions on your screen. 3. When Setup displays the system settings screen, choose the MS-DOS Path option. Type the drive and directory where you want to install MS-DOS, and press ENTER. Continue Setup. 4. After Setup is complete, open your CONFIG.NEW and AUTOEXEC.NEW files and ensure that their commands specify the correct path. Save the files as CONFIG.SYS and AUTOEXEC.BAT. Then restart your computer. 1.14 Bypassing the Uninstall Disk and Using Default Setup Options ----------------------------------------------------------------- To keep Setup from creating an Uninstall Disk, use the /G switch with the Setup command. To bypass the Uninstall disk and use default Setup options instead of choosing them yourself, use both the /H and /G switches with the Setup command. WARNING The primary purpose of the Uninstall disk is to safeguard your files during and after Setup. If Setup doesn't create an Uninstall disk, you will not be able to restore your previous version of DOS. If Setup should render your hard disk inaccessible, you will not be able to use the Uninstall disk to make it accessible again. NOTE If you have a version of MS-DOS earlier than 5.0, and you use the /G switch or the /H and /G switches together, Setup will not prompt you if you need to update your network files. 1.15 Installing MS-DOS 6.2 on a System with a CorelSCSI UNI_ASP.SYS Driver -------------------------------------------------------------------------- If your system uses the CorelSCSI UNI_ASP.SYS device driver for optical drives, and Setup stops running when you try to install MS-DOS 6, delete the DEVICE command in your CONFIG.SYS that loads the Corel UNI_ASP.SYS driver. Then run Setup again. After Setup is complete, reinstall the Corel UNI_ASP.SYS driver as you originally installed it. If you continue to have problems, contact Corel Customer Service. 1.16 Installing MS-DOS 6.2 if you have DrivePro or EZ-Drive ------------------------------------------------------------ If your hard disk was set up using Micro House DrivePro(TM) or EZ-Drive(TM), you must carry out one of the following procedures before you can install MS-DOS 6.2. o If your DrivePro or EZ-Drive floppy disks include the DOS6INST.EXE file, run the DOS6INST program and follow the instructions on the screen. (This program is also available on the Micro House BBS at (303) 443-9957.) o If you don't have the DOS6INST program, run the MHDRIVE program (if you have DrivePro) or the EZ-RESET program (if you have EZ-Drive). Press ENTER to accept the default answers until the program prompts you to insert MS-DOS Setup Disk 1. Insert the disk and then press ENTER. At the second Setup screen, choose "Continue Setup and replace your current version of DOS." (Note that this procedure will replace your current CONFIG.SYS and AUTOEXEC.BAT files with basic versions of these files.) For additional information, or if you encounter problems, contact Micro House Technical Support. 1.17 Additional Keyboard and Codepage Support ---------------------------------------------- MS-DOS 6.2 includes the KEYBRD2.SYS and EGA2.CPI files, which offer additional keyboards and codepages. You use these files just as you would the KEYBOARD.SYS and EGA.CPI files. The KEYBRD2.SYS file is essentially similar to KEYBOARD.SYS. The only differences are: o KEYBRD2.SYS contains support for the following keyboards, which are not supported by KEYBOARD.SYS: Country/Language Keyboard layout Keyboard ID ---------------- --------------- ----------- Canada (standard CAN/CSA-Z keyboard) cf 243.200-92 Brazil (secondary standard keyboard) br 274, 275 Greece gk 319 Iceland is 161 Romania ro 333 Turkish tr 440, 179 o The KEYBRD2.SYS file does not include support for the following keyboards supported by KEYBOARD.SYS: Switzerland (German) Switzerland (French) Japan o The KEYBRD2.SYS file provides access to a few keyboards by keyboard layout (two-letter code) only. KEYBOARD.SYS provides access to these keyboards by either keyboard layout or keyboard ID. The affected keyboards are: Poland Czechoslovakia (Czech) Czechoslovakia (Slovak) Yugoslavia Hungary o KEYBRD2.SYS contains changes to the German keyboard that are not in KEYBOARD.SYS. In the German keyboard, the SHIFT lock behavior of the top row of the keyboard now remains unaffected, and is now functionally the same as the US keyboard (that is, "typewriter mode" has been removed). The EGA2.CPI file is similar to the EGA.CPI file, except that the two files contain different code pages. EGA2.CPI contains the following: 850 - Multilingual (in both EGA2.CPI and EGA.CPI) 852 - Eastern European (in both EGA2.CPI and EGA.CPI) 857 - Turkish 861 - Icelandic 869, 737 - Greek MS-DOS 6.2 includes new country settings in COUNTRY.SYS that use the new keyboards and code pages. COUNTRY.SYS contains the following countries with their supported code pages: Country or language Country Character sets code ------------------------------------------------------ Greece 030 869, 737 Iceland 354 861, 850 Romania 040 852, 850 Turkish 090 857, 850 You use the KEYBRD2.SYS and EGA2.CPI files just as you would KEYBOARD.SYS and EGA.CPI. These files can be used in any combination. For example, to use the new Icelandic settings, carry out the following steps: 1. Add the following commands to your AUTOEXEC.BAT file: REM ICELAND SETTINGS MODE CON CP PREPARE=((861) C:\DOS\EGA2.CPI) MODE CON CP SELECT=861 KEYB IS,,C:\DOS\KEYBRD2.SYS 2. If you also need support for codepage 850 (Multilingual), add the following commands to your CONFIG.SYS file: REM ICELAND SETTINGS COUNTRY=354,861,C:\DOS\COUNTRY.SYS DEVICE=C:\DOS\DISPLAY.SYS CON=(,,2) Add the following commands to your AUTOEXEC.BAT file: REM ICELAND SETTINGS NLSFUNC MODE CON CP PREPARE=((861,850) C:\DOS\EGA2.CPI) MODE CON CP SELECT=861 KEYB IS,,C:\DOS\KEYBRD2.SYS 3. Restart your computer. 2. MEMMAKER AND MEMORY MANAGEMENT ================================= 2.1 Intel Expanded-Memory Driver (EMM.SYS) ------------------------------------------ If you use Intel's EMM.SYS driver with Aboveboard, use EMM.SYS version 4.0 revision E if you an ISA system, or EMM.SYS version 4.0 revision D if you have an MCA or other system. Contact Intel for a free upgrade. 2.2 Running MemMaker on a Computer with PC-NFS ---------------------------------------------- If you use PC-NFS network software, carry out the following procedure before you run MemMaker: 1. Open your MEMMAKER.INF file by using any text editor. This file is in the directory that contains your MS-DOS files. 2. Add the following line to the file: *NET 3. Save the file, and then run MemMaker. 2.3 You have a Super VGA display and want to conserve memory. ------------------------------------------------------------- If you use Microsoft Windows on an 80386 computer with extended memory and a Super VGA display, you can use the MONOUMB.368 file, in conjunction with MemMaker, to conserve conventional memory for running programs. To conserve memory if you have a Super VGA display: 1. Open your Windows SYSTEM.INI file, and find the [386Enh] section. 2. Add a DEVICE command for the MONOUMB.386 file, which is located in your MS-DOS directory. For example, if your MS-DOS files are in C:\DOS, add the following line to this section: DEVICE=C:\DOS\MONOUMB.386 3. Save the file, and restart your computer. 4. After your computer starts, run MemMaker by typing MEMMAKER at the command prompt. 5. Choose Custom Setup. On the Advanced Options screen, answer Yes to the question "Use monochrome region (B000-B7FF) for running programs?" Follow the instructions on your screen. 2.4 Using MemMaker with IBM LAN ------------------------------- Before you run MemMaker, you might need to make adjustments to the parameters specified for your IBM LAN support driver, DXMC0MOD.SYS. In your CONFIG.SYS file, make sure that the DEVICE command that loads DXMC0MOD.SYS includes one of the following before you run MemMaker: o The first three parameters, as in the following example: DEVICE=C:\DXMC0MOD.SYS 400000000001,D800,1 o No parameters, as in the following example: DEVICE=C:\DXMC0MOD.SYS o Some parameters and enough commas to fill in the first three parameters, as in the following example: DEVICE=C:\DXMC0MOD.SYS 400000000001,, 2.5 MemMaker and Adaptec SCSI devices ------------------------------------- MemMaker is compatible with Adaptec SCSI devices. However, if you use the ASPI4DOS.SYS driver to support your SCSI device, MemMaker by default will exclude this driver from the optimization process. If you don't use the SCSI device as your startup or boot drive, you can include the ASPI4DOS.SYS driver in the optimization process. To do so, remove the ^ASPI4DOS entry in the MEMMAKER.INF file, and then run MemMaker. 2.6 Using MemMaker on a computer with PC Tools or PC-DOS RAMBoost ----------------------------------------------------------------- You can use MemMaker or RAMBoost with MS-DOS, but not both at the same time. MemMaker will prevent RAMBoost from loading, but not remove its DEVICE= command from your CONFIG.SYS. 2.7 EMM386 detects an error in an application --------------------------------------------- If EMM386 displays a message such as "EMM386 has detected error #12 in an application," this indicates that the processor has reported an exception error to EMM386. An exception error typically occurs when an application gives the processor an instruction under invalid or unexpected conditions. In most cases, these errors are related to a specific program. If you are receiving an error that does not occur with any particular application, the error might be caused by a device driver or a memory-resident (terminate-and-stay-resident) program. To avoid these errors: o Try to identify the program involved. One way to do this is to see if the error occurs when the program is not running. If you suspect a memory-resident program or device driver, try bypassing it when your computer starts. o Try disabling EMM386. If a particular application is to blame, disabling EMM386 might allow that application to generate an error message. Disabling EMM386 might also change your memory configuration so that the error no longer occurs. o Try changing the order in which you load device drivers and memory-resident programs. This might help because some errors occur only under specific memory conditions. o If error 12 is occurring, this indicates that a stack is being used incorrectly. Try adding the following command to your CONFIG.SYS file: STACKS=18,512 o If error 13 is occurring, the program may be trying to use protected mode without cooperating with EMM386. You may need to obtain a VCPI-compliant version of the program, or not load EMM386 when using this application. 3. WINDOWS ========== 3.1 Your computer uses a Windows 3.0 permanent swap file. --------------------------------------------------------- If your computer uses a Windows 3.0 permanent swap file, run the SPATCH.BAT program to make the swap file compatible with MS-DOS 6. To do so, carry out the following procedure: 1. Copy the SPATCH.BAT file to your hard disk. To determine the location of the file on the Setup disks, view the PACKING.LST file on Setup Disk 1. 2. Type the following at the command prompt: SPATCH [DRIVE]:[PATH]SWAPFILE.EXE For the DRIVE and PATH parameters, specify the location of your SWAPFILE.EXE file. 3. Follow the instructions on your screen. The program modifies the SWAPFILE.EXE for use with MS-DOS 6 and saves a backup copy as SWAPFILE.SAV. After you have confirmed the file works correctly, you can delete the SWAPFILE.SAV file. 4. HARDWARE COMPATIBILITY WITH MS-DOS ===================================== 4.1 Compaq EXTDISK.SYS Driver ----------------------------- The Compaq EXTDISK.SYS driver version 3.00 or later is compatible with MS-DOS 6. If you have a version earlier than 3.00, contact your vendor for an upgrade. 4.2 Hardcard ------------ To use DoubleSpace on a system that uses its Hardcard drive as its startup drive, see section 7.9. For additional Hardcard information, see the following: a) Hardcard II If you can't use Plus Development Hardcard II or Hardcard II XL when running EMM386.EXE, specify the exclude (x=) switch to prevent EMM386 from conflicting with the card's BIOS address. To configure EMM386, run MemMaker. b) Hardcard 40 or Passport If you are using Hardcard 40 or a Passport removable disk, and you have a DEVICE command in your CONFIG.SYS file for PLUSDRV.SYS, disable or remove the DEVICE command. Then run MS-DOS 6.2 Setup. After Setup is complete, reenable or restore the DEVICE command for PLUSDRV.SYS. Make it the last line in the file. c) If you are unable to access your compressed drive after installing DoubleSpace on your Hardcard, try the following: 1) Add a DBLSPACE /MOUNT command to your AUTOEXEC.BAT file to mount the compressed volume file on the Hardcard every time you start your computer. 2) Or, ensure that there is at least one device driver (for example, ANSI.SYS) loaded in your CONFIG.SYS file AFTER the ATDOSXL.SYS driver but BEFORE the DBLSPACE.SYS driver. 4.3 Toshiba ----------- If you used the MS-DOS 5.0 version of EMM386 before you ran Setup, and you use the Power Management function, use the VRESUME program or device driver to avoid problems with the Resume feature. Carry out the following procedure: 1. Make sure the VRESUME.COM or VRESUME.SYS file is on your hard disk. To load the TSR, add a command for VRESUME.COM to your AUTOEXEC.BAT file. To load the device driver, add a command for the VRESUME.SYS file to your CONFIG.SYS file. 2. Save the file, and restart your computer. NOTE For information about using VRESUME with Windows 3.0, see the WRESUME.TXT file on your Toshiba MS-DOS 5.0 disks. 5. MICROSOFT PROGRAMS ===================== 5.1 Microsoft Anti-Virus ------------------------ Before cleaning a program file, make sure you have a backup copy of it. If you clean a program file, and the program is corrupted, reinstall the program. If Anti-Virus again detects a virus, there is a chance the detection is in error; contact your software vendor to determine if an updated version of the program is available. 5.2 Running Microsoft Backup for MS-DOS under Windows ----------------------------------------------------- You should not run Backup for MS-DOS while Windows is running. However, if you do, and if your system is not configured correctly, Backup might display the following symptoms: o Backup appears to stop running--for example, the clock runs, but there is no disk activity. o Backup reports problems while testing the second floppy disk during the compatibility test. For example, it might display a "Diskette not properly seated" message or ask for Disk 1 repeatedly. o Windows displays a message that the DMA buffer size needs to be increased. o Backup quits unexpectedly. You can correctly configure your system by carrying out the following procedure. 1. Open your SYSTEM.INI file, and add a DMABufferSize=32 line to the [386Enh] section. 2. When you run Backup, make sure that you specify with the Settings command from the Control menu that Backup run with the Exclusive and Full Screen options. 5.3 Backup for Windows stops running at the end of the compatibility test -------------------------------------------------------------------------- If Backup for Windows stops running at the end of the Compatibility Test, you might be loading an incompatible third-party backup driver in your SYSTEM.INI file. Carry out the following procedure. NOTE This procedure disables your third-party backup program. 1. Open your SYSTEM.INI file, and locate the [386Enh] section. 2. Determine whether any of the following lines are included in this section: DEVICE=FASTBACK.386 DEVICE=VFD.386 DEVICE=CPBVXD.386 DEVICE=VIRWT.386 3. If you find any of these lines, add a semicolon (;) to the front of the line. 4. Save the file, restart Windows, and run Backup for Windows again. 5.4 Running Microsoft Backup with TI4000 and Gateway NOMAD computers --------------------------------------------------------------------- To avoid a conflict between the Turbo feature and Microsoft Backup for Windows or MS-DOS, add a /L0 switch to the DEVICE command in your CONFIG.SYS that loads the BATTERY.PRO file. Or, before you run Microsoft Backup, type SETPOWER /L0 at the command prompt. 5.5 Microsoft Defragmenter -------------------------- If you received the "Insufficient Memory" message from Microsoft Defragmenter, use the MEM command to determine how much conventional, upper, and extended (XMS) memory is available. In addition to using all available conventional memory, Defragmenter can make use of up to 384K of extended memory and 12K of upper memory. To increase available memory, carry out the procedures in "An MS-DOS program displays an out-of-memory message" in the chapter "Diagnosing and Solving Problems" in the MICROSOFT MS-DOS 6 USER'S GUIDE. If less than 384K of extended memory is available, carry out the procedures in "Freeing Extended Memory" in the "Making More Memory Available" chapter in the MICROSOFT MS-DOS 6 USER'S GUIDE. 6. THIRD-PARTY PROGRAMS ======================= 6.1 4DOS and NDOS ----------------- 4DOS (prior to 4.02) and NDOS (prior to Norton Utilities 7.0) are compatible with MS-DOS 6. However, to use some of the new features in MS-DOS 6.2 (such as MemMaker, the LOADHIGH /L switch, DIR compression switches, overwrite protection with MOVE/COPY/XCOPY, and the ability to bypass startup commands), contact JP Software for an update to 4DOS, or Symantec for an update to Norton Utilities 7.0 or later. If you use multiple configurations, 4DOS or NDOS will not automatically run your AUTOEXEC.BAT file unless you include a /P on the SHELL line in your CONFIG.SYS file. To use MS-DOS 6.2 Help instead of 4DOS or NDOS Help, start it by using COMMAND /C HELP, or define a 4DOS or NDOS alias to run HELP.COM from your MS-DOS 6.2 directory. 6.2 Above Board 286 and Above Board Plus Installation Programs ----------------------------------------------------- Do not use an Above Board installation program dated May 1989 or earlier until you disable programs that use extended memory, such as SMARTDrive or RAMDrive. You might lose data if you leave these programs enabled. After you have installed Above Board, you can reenable these programs. 6.3 CodeView ----------- CAUTION Using versions 3.0 to 3.13 of the CodeView CV.EXE file may cause data loss if your system has an 80386 memory manager (such as EMM386.EXE) and device drivers or programs that use extended memory. To determine which version you have, type CV.EXE at the command prompt. 6.4 Colorado Tape Backup ------------------------ If you receive a message that you have two versions of the VFINTD.386 file loaded, you probably need to edit your SYSTEM.INI file. To do so, carry out the following procedure: 1. Open your SYSTEM.INI file and locate the [386Enh] section. You should see two lines similar to the following: DEVICE=C:\TAPE\CMSDTAPE.386 DEVICE=C:\DOS\VFINTD.386 2. If you plan to use your Colorado Tape Backup program, add a semi- colon (;) before the DEVICE command for the VFINTD.386 file. If you plan to use Microsoft Backup, add a semi-colon before the DEVICE command for the CMSDTAPE.386 file. 3. Save the file, and restart Windows. 6.5 Fastback Plus ----------------- If you have a version of Fifth Generation Systems Fastback Pluse earlier than 3.0, use the LOADFIX command before running Fastback Plus or the Fastback Plus installation program to ensure that you don't lose data. To do so, type the following at the command prompt: LOADFIX FB.EXE or LOADFIX FBINSTAL.EXE 6.6 Norton Desktop for Windows 2.0 ---------------------------------- Setup adds a second Tools menu which contains Microsoft Backup and Antivirus commands (if you installed these Windows programs), as well as a DoubleSpace Info command (if DoubleSpace is installed). If you use DoubleSpace to compress the drive that contains SmartCan, you might experience system problems afterward. To correct this, reinstall Norton Desktop for Windows. For information about Norton AntiVirus and DoubleSpace, see the following section. 6.7 Norton Utilities -------------------- The "Clear Space" option of Norton Speed Disk (prior to version 7.0) is incompatible with DoubleSpace drives. For an updated version of Norton Speed Disk, contact your software vendor. Do not use the WipeInfo utility on DoubleSpace drives. It can cause lost clusters. If you have already used this option, use the SCANDISK command to fix the lost clusters. If Norton AntiVirus is running when you use DoubleSpace to compress the drive that contains the NAV_.SYS file, DoubleSpace leaves a copy of the NAV_.SYS file on the host drive. This prevents Norton AntiVirus from reporting a virus infection during the compression process. After the compression process is complete, you can safely delete the copy of NAV_.SYS on the host drive. If you use the Norton Cache or Speedrive utilities, load the utility after the DEVICE command that loads DBLSPACE.SYS. For more information, see section 7.24. 6.8 PC Tools ------------ The DISKFIX /SCAN option in PC Tools can cause lost clusters on DoubleSpace drives (Microsoft SCANDISK detects and fixes lost clusters). If you have already used this option, use SCANDISK to fix the lost clusters. The FORMAT command of PC Tools version 7.1 conflicts with MS-DOS 6. Use the FORMAT command that comes with MS-DOS 6. The COMPRESS command of PC Tools versions 6.0 and 5.5 is incompatible with DoubleSpace. 6.9 QEMM 7.01 -------------- The Stealth DoubleSpace feature of QEMM 7.01 is incompatible with MS-DOS 6.2. If you use this feature, your computer will not start properly. To use the Stealth DoubleSpace feature, contact QuarterDeck Office Systems for an update. To work around this problem, press F8 when your computer starts. Answer Y to all prompts except the following: DEVICE=C:\QEMM\ST-DBL.SYS [Y/N]? When MS-DOS displays this prompt, answer N. (The pathname for ST-DBL.SYS may be different on your computer.) After your computer starts, edit your CONFIG.SYS file and make the following changes: * Disable the DEVICE command for ST-DBL.SYS by using the REM command. * Add a DEVICE command for DBLSPACE.SYS. For example: DEVICE=C:\DOS\DBLSPACE.SYS /MOVE 6.10 Johnson Computer Systems PC-Vault and PC-Vault Plus --------------------------------------------------------- If you use version 4.6 or earlier of the PC-Vault or PC-Vault Plus hard disk protection system, do not use the Maximum Floppy Boot Protection option if you use DoubleSpace. In these versions of PC-Vault and PC-Vault plus, the Maximum Floppy Boot Protection option is incompatible with DoubleSpace and may cause data loss. If your version of PC-Vault or PC-Vault Plus is earlier than 4.6, contact Johnson Computer Systems for an upgrade. 6.11 AddStor Double Tools -------------------------- AddStor's Double Tools version 1.0 includes a version of DBLSPACE.BIN that is incompatible with MS-DOS 6.2. When you install Double Tools, do not check the "Install enhanced DoubleSpace drivers" box. If you do, Double Tools will replace the MS-DOS 6.2 DBLSPACE.BIN file with the Double Tools version of DBLSPACE.BIN. The next time you start your computer, it will display the message "Wrong DBLSPACE.BIN version" and none of your compressed drives will be mounted. 7. DOUBLESPACE ============== 7.1 Converting Your XtraDrive Disk-Compression Software to DoubleSpace ---------------------------------------------------------- If your computer uses XtraDrive disk compression, use its uninstallation program to remove the compression, and then install DoubleSpace. 7.2 Converting Stacker 2.x or 3.0 Software to DoubleSpace ---------------------------------------------------------- If your drive has been compressed using Stacker version 2.x or 3.0, you can order a utility which automatically converts data that was compressed by Stacker compression software to the DoubleSpace format. To order this utility, use the Conversion Disk Offer coupon in the back of your user's manual. If your drive was compressed using a version of Stacker other than version 2.x or 3.0, carry out the procedure in sections 7.3 or 7.4 below. 7.3 Converting Stacker 3.1 Software to DoubleSpace --------------------------------------------------- If your drive has been compressed using Stacker version 3.1, carry out the following procedure to remove Stacker 3.1 and install DoubleSpace. 1. Use Stacker's UNSTACK command to unstack all your Stacker drives. (If you have floppy disks compressed by using Stacker, either unstack them now or make sure they were configured using Stacker's StackerAnywhere feature.) 2. Change to the root directory of your startup hard disk drive, and then type the following commands: ATTRIB -R-H-S STACKER.INI ATTRIB -R-H-S DBLSPACE.BIN DEL STACKER.INI DEL DBLSPACE.BIN 3. Restart your computer. 4. Run DoubleSpace Setup by typing DBLSPACE at the command prompt. 7.4 Converting Other Disk-Compression Software to DoubleSpace -------------------------------------------------------------- If you are not using Stacker 2.x, 3.0, or 3.1 disk compression or XtraDrive disk compression, carry out the following procedure to convert your disk-compression software to DoubleSpace. 1. Install MS-DOS 6.2 if you haven't already done so. 2. Use Microsoft Backup for MS-DOS to back up the files on your hard disk. If you didn't install Backup for MS-DOS during Setup, see the chapter "Getting Started" in the MICROSOFT MS-DOS 6 USER'S GUIDE for instructions on installing it. 3. If your Setup disks are compatible with drive A, insert Setup Disk 1 in drive A, and restart your computer. After Setup displays the first screen, quit Setup by pressing F3 twice. If your Setup disks are not compatible with drive A, create a startup floppy disk for drive A. To do this, insert Setup Disk 1 in drive B, and a blank floppy disk in drive A. Then type B:SETUP /F at the command prompt. When prompted, choose to install MS-DOS on the floppy disk in drive A. After Setup is finished, leave the disk in drive A, and restart your computer. 4. Use the FORMAT command to format the drive that contains the file that contains all of your compressed files. If you don't know where this file is located, see your disk-compression documentation. If you are reformatting drive C, include the /S switch to transfer system files to it. 5. If you formatted drive C, make sure Setup Disk 1 is in drive A or B, and type A:SETUP or B:SETUP at the command prompt. Follow the instructions on your screen. 6. After Setup is complete, install DoubleSpace by typing DBLSPACE at the command prompt. Follow the instructions on your screen. 7. Use Backup for MS-DOS to restore the files you backed up. NOTE When you run Microsoft Backup, you will have to configure it again. Also, you will need to retrieve the catalog file from your backup floppy disks. To do so, choose the Catalog button in the Restore dialog box. 7.5 DoubleSpace Setup indicates that your computer is running an incompatible disk-caching program. ---------------------------------------------------------------- If DoubleSpace Setup displays a message indicating your computer is running an incompatible disk-caching program, open your CONFIG.SYS or AUTOEXEC.BAT file, and delete the command that loads your disk-caching program. If you want to use a disk cache, add a line for the MS-DOS 6.2 SMARTDRV program in your AUTOEXEC.BAT file. For example, if your MS-DOS files are in a directory named DOS, add the following line: C:\DOS\SMARTDRV.EXE Quit your text editor, and restart your computer. Run DoubleSpace again. 7.6 Your compressed drive runs out of disk space. ------------------------------------------------- If your compressed drive runs out of free disk space, you can use the following techniques to free some space on the drive: o Enlarge that drive. o Carry out the DBLSPACE /DEFRAG /F and DBLSPACE /DEFRAG commands on that drive. The rest of this section explains each technique. Enlarging a Compressed Drive ---------------------------- You can enlarge a compressed drive to make more space available on it. Enlarging a compressed drive uses free space on the uncompressed (host) drive. To enlarge the compressed drive: 1. Start the DoubleSpace program by typing DBLSPACE at the command prompt. 2. Select the compressed drive you want to enlarge, and then choose the Change Size command from the Drive menu. The Change Size dialog box appears. The New Free Space line shows how much free space the compressed and uncompressed drives will have if you choose OK. 3. Specify a smaller number for New Free Space on the uncompressed drive. Notice that as you change this number, DoubleSpace adjusts the New Free Space amount for the compressed drive. When the New Free Space amount for both drives is what you want, choose OK. DoubleSpace enlarges the compressed drive. Carrying Out the DBLSPACE /DEFRAG /F and DBLSPACE /DEFRAG Commands on your Compressed Drive ------------------------------------------------------------------ You can sometimes free additional space on a compressed drive by more fully defragmenting the drive. NOTE You might want to carry out the following procedure overnight, since defragmenting a large or badly fragmented drive can take a long time. (To carry out the entire procedure overnight, create a batch file that contains both the commands in the procedure.) To free space by defragmenting the drive twice: 1. Make the compressed drive the current drive. 2. Type DEFRAG drive: /F at the command prompt Where drive: is the compressed drive. For example, DEFRAG C: /F. DEFRAG will fully defragment the drive's file allocation table, then start DBLSPACE /DEFRAG to consolidate the free space in the CVF. 3. When DEFRAG finishes, type DBLSPACE /DEFRAG /F at the command prompt. DoubleSpace re-consolidates the free space on the drive so there is as much free space as possible. 7.7 Your uncompressed (host) drive runs out of disk space --------------------------------------------------------- If your uncompressed (host) drive runs out of free disk space, you can enlarge it by reducing the size of any compressed drives that are stored on that uncompressed drive. Of course, this will reduce the amount of free space on the compressed drive(s). To enlarge the uncompressed (host) drive: 1. Start the DoubleSpace program by typing DBLSPACE at the command prompt. 2. Select the compressed drive whose size you want to reduce, and then choose the Change Size command from the Drive menu. (Select a compressed drive that is stored on the uncompressed drive that's out of space. To find out which compressed drives are stored on that uncompressed drive, type DBLSPACE /LIST at the command prompt.) The Change Size dialog box appears. The New Free Space line shows how much free space the compressed and uncompressed drives will have if you choose OK. 3. Specify a larger number for the New Free Space on the uncompressed drive. Notice that as you change this number, DoubleSpace adjusts the New Free Space amount for the compressed drive. When the New Free Space amount for both drives is what you want, choose OK. DoubleSpace reduces the size of the compressed drive, which makes more free space available on the corresponding uncompressed drive. 7.6 DoubleSpace did not compress all of your files because the drive ran out of disk space. ---------------------------------------------------------- If DoubleSpace indicates that it could not compress some of your files because there was not enough disk space, carry out the following procedure. 1. To determine which drive is your uncompressed drive, type DBLSPACE /LIST at the command prompt. 2. Using Microsoft Backup, back up to floppy disks the files on the uncompressed drive that were not compressed. 3. Delete the files on the uncompressed drive that were not compressed. 4. Type DBLSPACE at the command prompt. 5. From the Drive menu, choose Change Size. 6. To increase the size of your compressed drive, decrease the size of your uncompressed drive, and choose OK. 7. From the Drive menu, choose Exit, and use Backup to restore the files you backed up to your compressed drive. If you run out of space again, repeat steps 5 through 7 until the compressed drive is large enough. 7.9 Windows displays the message "The permanent swap file is corrupt." ---------------------------------------------------------------------- If you use a Windows permanent swap file, it must be located on an uncompressed drive. If your permanent swap file is on a compressed drive, Windows displays the message "The permanent swap file is corrupt" when it starts. When you install DoubleSpace, the DoubleSpace Setup program checks for the existence of a Windows permanent swap file. If it finds one, DoubleSpace Setup moves the swap file to your uncompressed drive. However, if you install Windows after installing DoubleSpace, or if you use Control Panel to change the location of your permanent swap file, your swap file might end up on a compressed drive. (When you specify a drive for your permanent swap file, Windows allows you to choose a compressed drive.) To move your permanent swap file to an uncompressed drive: 1. Start Windows. 2. At the "Permanent swap file is corrupt" screen, type Y in response to the question "Do you want to delete this swap file?", and then press ENTER. 3. Open Control Panel, and then double-click the 386 Enhanced icon. 4. Choose the Virtual Memory button. Windows displays a dialog box stating that a corrupt swap file was found and asks if you want to set the file's length to zero. 5. Choose the Yes button. Windows displays another Virtual Memory dialog box. 6. Choose the Change button. Windows displays swap-file settings. 7. In the Drive list box, select a drive that is not compressed. In the Type list box, select "Permanent." If your uncompressed drive does not have enough free space to create a permanent swap file, create a temporary swap file on either your compressed or uncompressed drives. (For information about freeing space on your uncompressed drive, see section 7.4.) When you have finished specifying swap-file settings, choose OK twice, and follow the instructions on your screen. 7.10 EXTDISK.SYS displays a warning about drive letters. --------------------------------------------------------- If you are using DoubleSpace on a Compaq computer, and your CONFIG.SYS file loads the EXTDISK.SYS device driver, EXTDISK.SYS displays the following message when it loads: WARNING: EXTDISK.SYS is not the first device driver to assign drive letters. Physical hard drive letters will not be contiguous. The EXTDISK.SYS driver still works properly. It displays this message because it expects to be the first module to assign drive letters, but because DBLSPACE.BIN loads before the CONFIG.SYS file and assigns some drive letters, EXTDISK.SYS is no longer first. (EXTDISK.SYS displays the message regardless of when the DBLSPACE.SYS device driver is loaded in the CONFIG.SYS file.) 7.11 You need a special device driver to use your startup drive --------------------------------------------------------------- If your startup hard disk drive requires a device driver in your CONFIG.SYS file, do not compress that drive. If you do, your computer will not start properly, since DoubleSpace will be unable to access your startup drive. (This is because MS-DOS loads DBLSPACE.BIN, the portion of MS-DOS that accesses compressed drives, before starting any of the device drivers in your CONFIG.SYS file.) To install DoubleSpace on a computer with a startup drive that requires a special device driver, use DoubleSpace Setup to compress a drive other than your startup drive, or use DoubleSpace Setup to create a new compressed drive using free space on any existing drive. 7.12 Defragmenting uncompressed drives after changing file attributes --------------------------------------------------------------------- You can safely defragment both your compressed or uncompressed drives, using the Microsoft Defragmenter or another defragmentation program, as long as you do not change the attributes of your compressed volume files. CAUTION If you change the attributes of a compressed volume file, and then defragment that uncompressed drive without first unmounting the compressed drives, you might lose data. If you want to fully defragment your uncompressed drive, you must first unmount all compressed drives located on the uncompressed drive, remove all their attributes, and then use DEFRAG or another defragmenter. 7.13 Files DoubleSpace cannot compress -------------------------------------- Some files (such as .ZIP files) are already compressed. DoubleSpace might not be able to compress such files any further. Encrypted data files, such as the Microsoft Mail 3.0 .MMF file, are not compressible and will be stored in uncompressed form, even if you store such files on a compressed drive. You might want to store uncompressible files on an uncompressed drive rather than on a compressed drive. Doing so can sometimes improve your system's speed. 7.14 Microsoft Defragmenter runs out of memory while you are compressing a drive. ------------------------------------------------------------------------ If the Defragmenter runs out of memory while you are compressing a drive, quit DoubleSpace, and then carry out the procedure in section 5.4 of this file. If the Defragmenter still runs out of memory after you have tried these procedures, there might be too many files on your hard disk for the Defragmenter to organize. For the program to work correctly, you might need to delete some files or move them to a floppy disk or a network drive. 7.15 DoubleSpace and PC-Vault ----------------------------- See section 6.10. 7.16 Maximum size of a compressed drive --------------------------------------- The maximum size for a DoubleSpace compressed drive is 512 megabytes (MB). For example, if you compress a disk drive that is 600 MB, the resulting DoubleSpace drive will be no larger than 512 MB. To compress the rest of the disk drive, run DoubleSpace, and choose Create New Drive from the Compress menu. Make the new compressed drive as large as possible. (If your drive is very large, you might need to create several new compressed drives in order to compress the entire drive.) 7.17 DoubleSpace could not mount a drive due to problems with the drive ------------------------------------------------------------------------ If the message "DoubleSpace could not mount drive X due to problems with the drive" (in which X is the drive letter) appears when you start your computer, then the internal organization of the drive has problems that prevent the drive from being used. DoubleSpace stores each compressed drive in a special file called a compressed volume file (CVF). The CVF is a file with the hidden, system, and read-only attributes; it is stored on an uncompressed drive. To use the compressed drive again, you need to run ScanDisk on that drive's compressed volume file, and then restart your system. The error message includes the name of the compressed volume file on which you need to run ScanDisk (for example, C:\DBLSPACE.000). To fix this problem for a compressed drive other than drive C: o Type the SCANDISK command specified by the DoubleSpace error message. For example, SCANDISK D:\DBLSPACE.001. (If MS-DOS cannot find the SCANDISK program, see the following procedure.) To fix this problem for compressed drive C, or if MS-DOS cannot find the SCANDISK program: 1. Insert Setup Disk 1 in drive A (or B) of your computer. 2. Change to the drive that contains Setup Disk 1. 3. To start ScanDisk, type the SCANDISK command as specified by the DoubleSpace error message. For example, SCANDISK C:\DBLSPACE.000. When ScanDisk displays dialogs describing any problems, choose the Fix It button. 4. After ScanDisk has finished, remove the floppy disk and restart your computer. 7.18 DoubleSpace finishes installation, but you cannot access your Hardcard ---------------------------------------------------------------------------- See section 4.2, part C. 7.19 You receive a DoubleGuard Alarm message --------------------------------------------- If a DoubleGuard Alarm message appears, DoubleGuard has detected that an application has damaged memory that DoubleSpace was using. Normally, each program "owns" a separate area of memory, and does not use memory that another program is already using. However, a few programs contain programming errors that cause them to inadvertently use memory belonging to another program. If such a program inadvertently uses memory belonging to DoubleSpace, that program could write its own data over the data DoubleSpace was storing there. Since the data that DoubleSpace stores in memory usually includes files you are currently using, this could cause damage to your data. DoubleSpace's DoubleGuard safety-checking feature detects when another program has violated DoubleSpace's memory, and immediately shuts down your computer to minimize the chance of data loss. If you receive a DoubleGuard Alarm message, do the following: 1. Restart your computer by pressing CTRL+ALT+DEL or by turning the power switch off and then on again. 2. Type the following at the command prompt: SCANDISK /ALL This runs ScanDisk on all your drives to detect and correct any problems that might have been caused by the program that violated DoubleSpace's memory. 3. Make a note of which program, if any, you were running when the DoubleGuard Alarm occurred. That program is probably (but not necessarily) the program that caused the DoubleGuard Alarm. If you receive additional DoubleGuard Alarms, take notes about what you were doing and see if you can detect a pattern. 7.20 A compressed drive is currently too fragmented to mount ------------------------------------------------------------- If you receive the message "Compressed drive X is currently too fragmented to mount" (in which X is the drive letter) when your computer starts, or if DoubleSpace displays the message "The X:\DBLSPACE.nnn file is too fragmented to mount," then DoubleSpace cannot mount the drive because its compressed volume file is stored in too many fragments on your hard disk. (DoubleSpace stores each compressed drive in a special file called a compressed volume file (CVF). The CVF is a file with the hidden, system, and read-only attributes, and is stored on an uncompressed drive.) To correct this problem, increase the MaxFileFragments setting in your DBLSPACE.INI file. DoubleSpace displays the "too fragmented to mount" error messages because the number of CVF file fragments exceeds this setting. Follow these steps: 1. Change to the root directory of your startup drive. (If your startup drive is compressed, change to that drive's host drive.) 2. Type the following command: TYPE DBLSPACE.INI 3. Note the current value for the MaxFileFragments setting. 4. Use the DBLSPACE /MAXFILEFRAGMENTS command to specify a higher value. For example, if MaxFileFragments is currently set to 128, you might type the following command: DBLSPACE /MAXFILEFRAGMENTS=200 5. Restart your computer. DoubleSpace should now be able to mount the drive. If DoubleSpace still cannot mount the drive, follow these steps: 1. Run ScanDisk to check the reliability of your hard disk by typing the following at the command prompt: SCANDISK /ALL /SURFACE 2. Restart your computer. If DoubleSpace still cannot mount the drive, proceed to step 3. 3. Remove the Read-Only, System, and Hidden file attributes on the DBLSPACE.<XXX> file. For example, if the file is H:\DBLSPACE.000, type the following at the command prompt: ATTRIB H:\DBLSPACE.000 -R -S -H 4. Run Microsoft Defragmenter (Defrag) by typing DEFRAG at the command prompt. 5. Use the ATTRIB command to reset the file attributes on DBLSPACE.<XXX>. For example, if the file is H:\DBLSPACE.000, type the following at the command prompt: ATTRIB H:\DBLSPACE.000 +R +S +H 6. Restart your computer again. DoubleSpace should now be able to mount the compressed drive. 7.21 DoubleSpace displays the message "Your computer is running with an incompatible version of DBLSPACE.BIN" ---------------------------------------------------------------- If you try to run the MS-DOS 6 version of DBLSPACE.EXE with MS-DOS 6.2, it displays the following message: Your computer is running with an incompatible version of DBLSPACE.BIN. You must update DBLSPACE.BIN on the root directory of drive @. DBLSPACE.EXE has detected that its version number does not match that of your MS-DOS 6.2 DBLSPACE.BIN. To correct this problem, you need to update this copy of the DBLSPACE.EXE file. When you run MS-DOS 6.2 Setup, it updates the DBLSPACE.EXE file in the directory that contains your MS-DOS files. If there are other copies of DBLSPACE.EXE elsewhere on your disk -- for example, in the root directory of your host drive -- Setup does not update those additional copies. To update them yourself, use the COPY /Y command to copy the MS-DOS 6.2 version of DBLSPACE.EXE over the older versions. (The MS-DOS 6.2 version of DBLSPACE.EXE is located in the directory that contains your MS-DOS files.) 7.22 Using the DBLSPACE command after bypassing DBLSPACE.BIN ------------------------------------------------------------- If you bypass DBLSPACE.BIN when you start your computer (by pressing CTRL+F5 or CTRL+F8), then the DBLSPACE command may not work as expected: * Usually, if DoubleSpace is installed, typing DBLSPACE runs the DoubleSpace program. However, if you type DBLSPACE when DBLSPACE.BIN is not loaded, DoubleSpace Setup starts instead. If this happens, quit DoubleSpace Setup. * If you type the DBLSPACE /MOUNT command, it reports that there are no more drive letters for DoubleSpace to use. (DoubleSpace cannot mount a compressed drive unless DBLSPACE.BIN is loaded.) To use DoubleSpace or your compressed drives, restart your computer without bypassing DBLSPACE.BIN. 7.23 Removing the write-protection from a compressed floppy disk ----------------------------------------------------------------- If you are using a compressed floppy disk that is write-protected and Automounting is enabled, the disk will remain write-protected until it is unmounted -- even if you remove the write-protect tab from it. To remove the write protection, use either of the following methods: * Unmount the floppy disk by using the DBLSPACE /UNMOUNT command, and then try using the disk again (this will automatically remount it). For example, if the disk is in drive B, you would type DBLSPACE /UNMOUNT B: and then try using the disk again. (If Windows is running, you can't use the DBLSPACE /UNMOUNT command. In that case, use the following method.) * Insert a different floppy disk in the drive and access it (for example, carry out the DIR command on it). This automatically unmounts the compressed floppy disk that was previously in the drive.) Then, reinsert the compressed floppy disk and try using it again (this will automatically remount it). 7.24 Automounting and Norton disk-caching utilities ---------------------------------------------------- If you use a Norton disk-caching utility such as Norton Cache (NCACHE2.EXE) or Norton Speedrive (SPEEDRV.EXE) make sure the utility is loaded after the DEVICE command for DBLSPACE.SYS. If you load one of these utilities before DBLSPACE.SYS, DoubleSpace's automounting feature will not work.