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-
- DISABLING WRITE CACHING
-
- To avoid potential write caching problems, you may want to
- disable the DOS 6 SmartDrive write caching feature.
- However, first you will need to know about the DOS 6
- AUTOEXEC.BAT file.
-
- Below is a typical DOS 6 AUTOEXEC.BAT file for an 80286, an
- 80386, or an 80486 machine.
-
- @ECHO OFF
- PATH C:\DOS;C:\WINDOWS;C:\UTILS
- PROMPT $P$G
- SET TEMP=C:\DOS
- SMARTDRV
-
- You can use EDIT, the built-in DOS editor, to make or modify the
- AUTOEXEC.BAT file or the CONFIG.SYS file. Both of these
- files reside on the root directory of your start-up disk. Remember,
- the changes you make when you modify an existing
- AUTOEXEC.BAT or CONFIG.SYS file will not take effect until
- you restart your computer. Never make a modification to either
- the AUTOEXEC.BAT file or the CONFIG.SYS file without first
- making a backup of these important files on diskette. If your
- start-up disk is drive C, you can load the AUTOEXEC.BAT file into
- EDIT by typing:
-
- edit c:\autoexec.bat <ENTER>
-
- When you are in EDIT, you can press <F1> for more help. If
- you make changes, don't forget to save the file by pressing:
-
- <ALT>
- f
- s
-
- Note that the last line in the sample AUTOEXEC.BAT file is
- SMARTDRV. SMARTDRV is a disk cache that works with
- computers that have extended memory. If you have an 80286 or
- greater machine with at least 1 megabyte of memory, then you can
- probably use SMARTDRV. A disk cache uses a portion of memory
- to store information that DOS reads from disk. DOS can read
- information from the disk cache much faster than it can read
- information from a drive. The result is that you will get a big
- performance boost if you use a disk cache.
-
- The DOS 6 SMARTDRV will cache both floppy and hard drives
- and is faster than the DOS 5 SMARTDRV. The DOS 6
- SMARTDRV is very similar to the one that is included with
- WINDOWS 3.1 and can be loaded in the AUTOEXEC.BAT file.
- The DOS 6 version of SMARTDRV will automatically calculate
- values by determining how much upper memory exists in your
- machine. It will also automatically load itself into high
- memory if it is available.
-
- The DOS 6 SMARTDRV will do read caching and write caching
- for hard drives and read caching for floppies. With write
- caching, you could lose data if you turn your computer off
- immediately after quitting a program.
-
- IT IS BEST TO WAIT AT LEAST FIVE SECONDS AFTER YOU QUIT AN
- APPLICATION BEFORE YOU TURN THE MACHINE OFF.
-
- On drives that are write cached, SMARTDRV waits until the
- cache is about full, or until there has been about 5 seconds of
- idle time, before writing the data to your hard drive. If you
- want to force the write cache to immediately write the data to
- the hard drive, type:
-
- smartdrv /c <ENTER>
-
- ▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄
-
- To avoid potential write caching problems, you may want to
- disable the DOS 6 SmartDrive write caching feature.
-
- ▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄▄
-
- You can disable write caching by following the SMARTDRV
- command with the letters of your hard drives. Suppose you had
- hard drives C, D, E, and you wanted to disable write caching on
- these drives. Use the DOS EDIT program to change the
- SMARTDRV line in the AUTOEXEC.BAT file to read the
- following:
-
- SMARTDRV C D E
-
- The above line tells DOS to allow read caching while disabling
- write caching for drives C, D, and E. Don't try to cache a
- DoubleSpaced drive. SmartDrive will not cache compressed
- drives (DoubleSpaced drives), CD-ROM drives, network drives,
- or RAM drives. If you are running DoubleSpace, you can get
- information on all your drives by typing:
-
- dblspace /info <ENTER>
-
- If you want to see which drives SMARTDRV is caching, at the
- system prompt type:
-
- smartdrv <ENTER>
-
- For more information on the DOS 6 SMARTDRV command, type:
-
- help smartdrv <ENTER>
-
-
-
-
- This section is finished. It is an excerpt from LEARNING DOS FOR
- THE COMPLETE NOVICE, by Steven Woas, copyright 1993. When you register
- this program, you will receive the 336 page book, LEARNING DOS FOR THE
- COMPLETE NOVICE which covers DOS 3.2 through DOS 6. To register send
- $15.95 plus $2.00 for shipping to:
-
-
- Celestial Press
- 4424 Dohrcrest Dr.
- Suite C
- New Port Richey, FL 34652
-
- Phone (813) 845-8522
- US customers can order toll-free 1-800-330-3311
- Fax (813) 845-8522
-
- We accept Visa & MasterCard
-
- Florida orders add 6% sales tax.
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