Situations in Which DEFRAG Cannot Run (96519)
The information in this article applies to:
• 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 Q96519
Microsoft DEFRAG operates on the MS-DOS logical drive level only.
Third-party partitioning utilities that modify or translate disk
geometry (such as Disk Manager and SpeedStor) operate beneath the
MS-DOS file system and are therefore transparent to DEFRAG.
DEFRAG cannot share access to a drive with other tasks; therefore, you
cannot run DEFRAG if Windows or DESQview is running.
DEFRAG does not work in the following situations:
Network Drive Network software usually does not allow full
single-tasking access to the entire drive,
including the file tables. Often network drives
(such as Novell NetWare) use another file system.
CHKDSK Errors Errors in the drive organization can cause
unpredictable results from DEFRAG. DEFRAG
identifies most CHKDSK errors while reading
the drive organization, and then refuses
to run until you correct them.
Windows DEFRAG cannot operate properly in a
multitasking or task-switching situation;
therefore, it detects Windows in real, standard,
and 386 enhanced modes and does not run.
Task Swapper DEFRAG cannot operate properly in a
task-switching situation; therefore, it detects
the MS-DOS Shell task swapper and does not run.
Interlnk Drives Interlnk is not designed to support defragmentation
and other low-level utilities. Specifically, it does
not implement interrupts 25 and 26.
Fastopen The Fastopen program tracks which files are located
in which clusters on your disk. DEFRAG rearranges
data on a cluster level, which confuses Fastopen.
JOIN JOIN does not allow normal access to a drive.
SUBST SUBST drives do not have their own file tables or
directories to optimize.
The products included here are manufactured by vendors independent of
Microsoft; we make no warranty, implied or otherwise, regarding these
products' performance or reliability.
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