Specifications

5.1 WRITE ERRORS
SECTION V
ERROR RECOVERY
If an error occurs during a write operation, it will be detected on the next revolution by doing a read operation,
commonly called a write check.
To correct the error, another write and write check operation must be done. If the
write operation is not successful after 10 attempts, a read operation should be attempted on another track to deter-
mine
if the media or the drive is failing. If the error still persists. the disk should be considered defective and
discarded.
5.2 READ ERRORS
Most errors that occur will be soft errors; that is, by performing an error recovery procedure, the data will be
recovered.
Soft errors are usually
caused by:
a. Airborne contaminants that pass between the read/write head and the disk. These contaminants
will generally be removed by the cartridge self-cleaning wiper.
b.
Random electrical noise which usually lasts for a few microseconds.
c. Small defects
in the written data and/or track not detected during the write operation which may
cause a soft error during a read.
The following procedures are recommended to recover from soft errors:
a. Reread the track 10 times or until such a time as the data is recovered.
b.
If data is not recovered after using step (a). access the head to the adjacent track in the same
direction previously moved, then return to the desired track.
c. Repeat step (a).
.
d. If data is not recovered, the error is not recoverable.
5.3 SEEK ERRORS
Seek errors are detected by reading an 10 field after the seek is completed. The 10 field contains the track address.
If a seek error is detected, the host system should issue a recalibrate operation (step out until Track 00 line goes ac-
tive)
and seek back to the original track.
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