UNFORMAT Does Not Work on Disk Manager Partition (71812)
The information in this article applies to:
• Microsoft MS-DOS operating system 5.0
This article was previously published under Q71812
Because MS-DOS recognizes only up to 1024 cylinders on a physical hard
drive, the MS-DOS 5.0 UNFORMAT command restores only partitions at or
under the 1024 cylinder limit. It does not restore a partition created
using Ontrack Computer Systems' Disk Manager if that partition spans
the 1024 cylinder boundary on a physical hard drive.
If a partition created using third-party partitioning software spans
the 1024 cylinder boundary, it will not be restorable using the MS-DOS
UNFORMAT command unless the device driver accompanying the software is
first loaded. For example, it is possible to restore such a partition
created using SpeedStor because its drivers, HARDRIVE.SYS or
SSTOR.SYS, can be loaded whether or not a SpeedStor partition is
However, Disk Manager's driver, DMDRVR.BIN, does not load unless there
is a Disk Manager partition detected. Because DMDRVR.BIN does not
load, UNFORMAT cannot look beyond the 1024 cylinder boundary;
therefore, you cannot use UNFORMAT to restore the partition.
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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