Microsoft DOS diskcomp command

Updated: 05/21/2018 by Computer Hope

About diskcomp

Compares the contents of a floppy disk in the source drive to the contents of a floppy disk in the target drive.


The diskcomp command is an external command and is available in the below Microsoft operating systems as

Note: This command was not included with Microsoft Windows 95, Windows 98, or Windows ME. However, if you upgraded Windows 95 from Windows 3.x, this file would still be available.

Diskcomp syntax

Windows 2000, XP, Vista, 7, and 8 syntax

Compares the contents of two floppy disks.

DISKCOMP [drive1: [drive2:]]

Early versions of MS-DOS Syntax

DISKCOMP Source: Target: /1 /8

Source: Source drive containing one of the floppy disks to be compared.
Target: Target drive containing the other disk to be compared.
/1 Compares only the first side of the disks.
/8 Compares the first 8 sectors per track.

Diskcomp examples

diskcomp a: b: /1

Compares the first side of A: with B:

Additional information

This command cannot be used with a hard drive and must be only used with floppies that are the identical size.

The diskcomp exit codes are:

0 - Disks are the same.
1 - Disks are different.
2 - Process aborted with Ctrl+C by user.
3 - Critical error.
4 - Initialization error.