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Situations in Which DEFRAG Cannot Run

This article was previously published under Q96519
This article has been archived. It is offered "as is" and will no longer be updated.
Microsoft DEFRAG operates on the MS-DOS logical drive level only.Third-party partitioning utilities that modify or translate diskgeometry (such as Disk Manager and SpeedStor) operate beneath theMS-DOS file system and are therefore transparent to DEFRAG.

DEFRAG cannot share access to a drive with other tasks; therefore, youcannot run DEFRAG if Windows or DESQview is running.
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DEFRAG does not work in the following situations:
   Situation        Reason   ----------       ------   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 ofMicrosoft; we make no warranty, implied or otherwise, regarding theseproducts' performance or reliability.
6.22 6.00 3rd party defrag 6.20

Article ID: 96519 - Last Review: 10/26/2013 13:39:00 - Revision: 2.0

Microsoft MS-DOS 6.0 Standard Edition, Microsoft MS-DOS 6.2 Standard Edition, Microsoft MS-DOS 6.21 Standard Edition, Microsoft MS-DOS 6.22 Standard Edition

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