_ DEC-O-LOG for RA90X

_ DOL, RA90X-O001, (SA600) Drives APR 89

PROBLEM: Drives exhibit: 1.) Large numbers of Uncorrectable ECC
errors, and 6-8 symbols in errors. 2.) Occurrence was predominately on
the first 5 heads. 3.) Occurrence was presominately from cylinder 1900
thru 2649. 3.) BBR was being invoked and the blocks were being
replaced about 80% of the time.

FIELD EFFECTIVITY: Must be installed on all SA600/RA90 Drives running
with Drive Microcode Revision 7 or earlier.

QUICK CHECK: The customer applications/operations that are prone to
show this syndrome are:  1.) At HSC Console, perform ">SHOW DISK". 
Version number is displayed as MC=8 or later. 2.) At the HSC, perform
a SHOW DISKS and verify the HV and MC revisions of the drive.  Each
RA90 upgraded should reflect HV=17 and MC=8 (or later).

FCO KIT ORDERING:
EQ-01540-01 Retrofit Kit A 
EQ-01540-03 Retrofit Kit C
FA-04846-01 FCO only


_ DOL, RA90X-O002, RA90X Disk Drives, (Cancelled) Sep 89


_ DOL, RA90X-F003, RA90 Disk Drives, Sep 90

PROBLEM: RA90 long arm HDA's may exhibit a hazing condition caused 
by a hazing contaminate inside the HDA.  This microcontaminate may
induce the following error codes upon an extended power down situation.
The resultant error codes are: 13, 15, 59, 5A, 60, 62, 63, CD, and E6.

FIELD EFFECTIVITY: This FCO should be installed on all RA90 disk drives
with HDA's installed that are below the revision level of "N12". HDA's
at or below build dates CX926XXXXX and KB928XXXXX produced before July,
1989 are affected.

QUICK CHECK: Drive hardware revision is 25 and the drive microcode
is revision V26 or higher. (OR) The drive takes about 1 minute, 15
seconds to come ready on spin-up.

FCO KIT ORDERING

EQ-01593-01 FCO, Parts
FA-04923-01 FCO Document