Cause: Resetting the BIOS Geometry breaks the Duplidisk mirror. We have a reported problem with SCO Open Server 5.0.x UNIX when deploying drives LARGER than 8.4 gigabyte, including BIOSGEOM in the bootstring. This is caused by the older system BIOS not supporting Extended int-13.

Corrective Action:

FIXES:
1. Obtain a system BIOS upgrade to supply the >8.4 gig drive support.
2. When setting up BIOSGEOM, subtract 1 (one) cylinder from the primary drive cylinder count.

Check the following links:
Overriding disk geometry -- biosgeom

http://www.storage.ibm.com/hdd/library/8.4gb.htm

For a complete description of the system BIOS problem.

NOTES:
Check “Overcoming BIOS Limitations” in the SCO OpenServer Handbook for more information.