MS-DOS 6.2 Defrag Uses XMS Memory When Available (103520)
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 Q103520
Microsoft MS-DOS 6.0 Defragmenter (Defrag) relies exclusively on
conventional memory to hold all drive file allocation table (FAT) data
and the disk directory structure.
Both MS-DOS 6.0, 6.2, and 6.21 Defrag use a 12,000-byte upper memory block
(UMB) for data storage if it is available. MS-DOS 6.2 Defrag uses up to 384
kilobytes (K) of extended (XMS) memory, when available, to hold the FAT
data for the drive. If you receive "out of memory" errors with MS-DOS 6.2
Defrag, increase conventional memory and/or XMS memory up to 384K.
NOTE: If /SKIPHIGH is specified, the 12,000-byte UMB and the 384K free
XMS memory are not used.
If you have 384K of XMS memory and Defrag still does not run, free more
conventional memory. If you cannot free more conventional memory by using a
memory manager (such as EMM386.EXE) or by removing optional device drivers,
you must reduce the number of files and directories on your drive to allow
Defrag to run. This requires transferring, orbacking up and removing, files
from your disk drive.
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