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Action
Recovery Procedure
1
Exit with Program Error indication.
2
Repeat original sequence once.
If the error condition still occurs, print Message 1 for the operator and/or customer engineer notification. This is considered an uncorrectable
error; the recovery procedure depends on the application.
3
Repeat the original sequence ten times if the error persists.
After ten unsuccessful retries, print Message 1 for the operator and/or CE notification.
4
Issue a Recalibrate command.
Seek to the original address.
Repeat the original sequence ten times if the error persists.
Print Mesaage 1 and exit with the error indication.
5
Repeat the original sequence ten times if the error persists.
After ten unsuccessful retries, the error is said to be "hard". At this point, the hard-error recovery procedure may be employed at the
user's option.
Print Mesasge 1 and exit with the error indication and option information.
6
If this is an alternate track, use the defective-track address, plus 1, in the Seek command. (This is found in the ID field of the RO count
area.) Resume the operation after searching to the desired track position.
If this is a defective track, use the alternate-track address in the Seek command. (This is found in the ID field of the RO record.) Resume
the operation after searching to the desired track position.
7
Issue a Read Home Address command to verify that the correct track has been reached. (Correct cylinder is sufficient on multitrack
operation.)
If the correct cylinder (and/or track) is found, perform Action 1.
If the incorrect cylinder (and/or track) is found, perform Action 4.
8
Repeat the original sequence sixteen times if the error persists.
After sixteen unsuccessful retries, issue instructions to Recalibrate, and then Seek to the original cylinder. Repeat first two steps sixteen
times if the error persists.
After sixteen unsucceesful retries of second step (a total of 256 entries for the data), the data-error is said to be "hard". At this
point, the hard-error recovery operations may be employed at the user.s operation.
Print Message 1 and exit with the data-error indication and option information.
9
Issue a Recalibrate and then a Seek to the original address.
Repeat the operation that failed.
Repeat the first two steps twice if the error persists.
Issue a Read HA to a different track in some cylinder.
If the Read HA is successful, return to the original track and perform Action 3.
If the Read HA is unsuccessful after two tries and causes the same error indication, print Message 1 for operator and/or CE notification.
Figure 2-7. Error conditicn !able 2311/DAC <Part 2 of 2)
2-28 (7/69)
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