Possible CHKDSK Errors with Coherent Partition and MS-DOS (75193)

The information in this article applies to:
    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 Q75193


CHKDSK returns an invalid value for total disk space if the Coherent Setup utility is used to "shrink" a logical DOS partition.


Coherent is a UNIX operating system clone. During the installation of Coherent, the Setup program can shrink the logical DOS partition and create a non-DOS partition for the Coherent operating system. After this has been done, CHKDSK will return the size of the extended DOS partition as the sum of the extended DOS partition and the non-DOS (Coherent) partition.

FDISK will return the correct partition sizes when "Display Partition Information" is selected.

The problem occurs because Coherent's Setup program only modifies the master boot record (MBR) entries and not the other linked partition tables or the modified logical drive boot sectors.

Coherent is produced by:

Mark Williams Company
Northbrook, IL
(708) 291-6700

The product included here is manufactured by vendors independent of Microsoft; we make no warranty, implied or otherwise, regarding this product's performance or reliability.

Modification Type: Major Last Reviewed: 5/12/2003
Keywords: KB75193