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3
2
Interface Information
7957A/7958A
Table 2-3. Standard Status Response Bits (2 of 2)
Write Gate With Track Offset. This bit indicates that the controller activated
WRITE GATE while the drive was configured for a nonzero track offset. The
controller should restore the track offset to zero, and then retry the write
operation.
Vendor-Unique Status Available.
This bit indicates that vendor-unique status is
valid and available to the controller. This information is intended for use by
service-trained personnel. The controller should not initiate any action based
on the content of the vendor-unique status.
Write Fault. This bit indicates that a write fault has occurred. This fault can
be caused by a variety of conditions; however, regardless of the cause, the con-
troller should retry the write operation a minimum of five times.
For
simplification, the controller may elect to use the same recovery routine
recommended for the preceding Write Gate With Track Offset fault.
A Write Fault can be caused by one of the following conditions:
•
The controller activated WRITE GATE while the head was physically
off track center.
•
The controller activated WRITE GATE while the spindle motor was off
speed.
•
The controller activated WRITE GATE while COMMAND COMPLETE
was inactive. The controller must wait for the drive to activate
COMMAND COMPLETE before retrying the write operation.
• The controller attempted a write with an illegal head selected.
• The controller attempted a write while the spindle was out of write speed
tolerance.
• The controller attempted a write while the spindle was not spinning.
• The controller attempted a write while ATTENTION was set.
• The drive's R/W preamp chip indicated a Write Unsafe condition.
2-5
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