FASTOPEN Harmful If Used with Disk Optimizers/Cachers (32169)
The information in this article applies to:
- Microsoft MS-DOS operating system 3.1
- Microsoft MS-DOS operating system 3.2
- Microsoft MS-DOS operating system 3.21
- Microsoft MS-DOS operating system 3.3
- Microsoft MS-DOS operating system 3.3a
- Microsoft MS-DOS operating system 4.0
- Microsoft MS-DOS operating system 4.01
- Microsoft MS-DOS operating system 5.0
- Microsoft MS-DOS operating system 5.0a
- Microsoft MS-DOS operating system 6.0
- Microsoft MS-DOS operating system 6.2
- Microsoft MS-DOS operating system 6.21
- Microsoft MS-DOS operating system 6.22
This article was previously published under Q32169 SUMMARY
Using the FASTOPEN command with commercial disk optimizers or disk-caching
software can cause damage to the hard disk's file system.
Do not use software that performs INT 26h or INT 13h absolute disk writes,
such as disk-caching or disk-optimizing software, with FASTOPEN loaded.
Before using such software, remove the FASTOPEN statement from the file
CONFIG.SYS and reboot the computer.
MORE INFORMATION
Because MS-DOS does not need to read the FAT table each time these files
are accessed, FASTOPEN stores the locations of files and directories in
memory, making access to these files faster than normal. When a disk
optimizer moves files around with absolute disk writes (INT 26h), the
location of the file on the file system has changed. However, FASTOPEN does
not realize that the file has been moved, and keeps its outdated map of the
file in memory. If the file is accessed after the disk optimization, the
file is not properly read. This can cause file-system integrity problems.
| Modification Type: | Major | Last Reviewed: | 5/12/2003 |
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| Keywords: | KB32169 |
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