IBM 5170  -  Failures of the CMI 6426 Hard Drive

The first hard drive supplied by IBM in the IBM 5170 was CMI's model 6426-S (sometimes referred to as the CM-6426 or CM6426).
The very high failure rate of those drives led to IBM moving to the Seagate ST-4026.

Below are some magazine articles relating to the failures.

The specifications of the drive are shown on page 2 of the CMI document here.

Date:   January 1985
Magazine:   Computerworld Magazine, Jan 1985
Article:   Microsoft: PC-DOS release will solve start-up bugs in AT drive
Comment:   DOS 3.1 released.  Better copes with bad tracks at start of drive.  See here for the limitation (not a bug) in 3.0
Date:   March 1985
Magazine:   InfoWorld Magazine, Mar 1985
Article:   PC AT Problems Cause Concern for Owners
Date:   June 1985
Magazine:   PC Magazine, June 1985
Article:   The AT's Slipped Disk
Date:   July 1985
Magazine:   InfoWorld Magazine, Jul 1985
Article:   Reliability is Hard Disk Key
Comment:   The 6426 is one of the drives compared and negatively commented on.
Date:   April 1986
Magazine:   PC Magazine, April 1986
Article:   From Sea to Shining Sea
Comment:   This is an excellent summary.

CMI 6426-S.jpg