Troubleshooting - IBM 0663 Series Manual

Configuration Required:
Alter MODE SELECT Page 0, Byte 2 to '40'
Alter MODE SELECT Page 0, Byte 3 to '80'
Platform
Operating System(s) Proprietary (Supplied with platform)
Configuration Required:
Connect 'OPTION PIN' on drive jumper block to ground.
Platform
Operating System(s) Proprietary (supplied with platform)
Configuration Required:
No modification to the drive are required. However, attachment to many APPLE systems is not
possible using the device drivers supplied.
There are third-party device drivers which allow attachment including 'SPOT ON' from MacPeak
Research.
These overcome the incompatibility associated with the drive returning the 'UNIT ATTENTION'
condition in response to the first SCSI command following power-up or a SCSI bus RESET.
They also allow the APPLE 'Blind Write' feature to be turned off, which is necessary since this
feature is not supported by the drive and would result in SCSI Write errors occurring.
PLEASE NOTE THAT TURNING 'BLIND WRITE' OFF WILL RESULT IN DEGRADED
SYSTEM PERFORMANCE WRITE OPERATIONS.
TROUBLE SHOOTING
The drive reports status in response to the SCSI 'Sense' command and this is a powerful
troubleshooting tool on any drive whose failure mode still allows it to communicate.
If the drive is interrupted by powering down during a format operation it will enter degraded
mode. In this mode it will return a 'Unit Attention' condition to most SCSI commands.
Issuing a 'Sense' Command immediately after issuing a 'Test Unit Ready' Command will return
sense data which indicates that the drive is in degraded mode.
The way to recover the drive is to issue the SCSI 'Format' command and allow the drive to format
to completion.
PRODUCT VARIATIONS
Model Comments
PN 0663 L12 8 disk version of L12 (1 GB) drive with low power
55F5208 (11 msec) actuator. Preferred where low power
dissipation is of more importance than high seek
performance. Production of this drive has been
HEWLETT PACKARD
HP9000-710
APPLESYSTEMS