Hyperdisk Conflicts with SETUP and FORMAT (74339)

The information in this article applies to:
    Microsoft MS-DOS operating system 5.0
    Microsoft MS-DOS operating system 5.0a

This article was previously published under Q74339


The current version of Hyperdisk 4.21 conflicts with Microsoft MS-DOS 5 Upgrade SETUP.EXE and FORMAT.COM.

Hyperdisk fails to monitor the change of media BIOS call and fails to recognize a disk swap. This causes difficulties with SETUP and FORMAT.

To resolve this problem, use the /OC switch on the Hyperdisk device driver line in the CONFIG.SYS file. For example:


For more information on this product, contact Hyperware.

The product included here, Hyperdisk, 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: 9/30/2003
Keywords: KB74339