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BIT
BYTE
07
06
05
04
03
02
01
00
00
------1-------1------1------1------1------1------1------
(MSB)
Sectors Read Count
01
Sectors Read Count
02
Sectors Read Count
(LSB)
03
(MSB)
Seek Usage Count
04
Seek Usage Count
05
Seek Usage Count
(LSB)
06
Uncorrectable Data Check Count
07
Correctable Data Check Count
08
Seek Check Count
Figure 6-18.
READ/RESET USAGE COUNTER Parameters
The Sectors Read Count is a complete count of all logical blocks
read to any host from the speci f ied dr i vee
Th i s provides usage
information against which error counts can be calibrated.
The Seek Usage Count is a complete count of all occurrences of an
initial seek by the drive.
Cylinder switching is not counted.
The Uncorrectable Data Check Count counts all occurrences of an
uncorrectable data check on the specified device.
Each Uncor-
rectable data check was also posted as a IlH error code.
The Correctable Data Check Count counts all occurrences of the
successful recovery of a logical block that was unsuccessfully
.read at first.
This information is available only through error
logging,
since these errors are recovered without notifying the
host unless a diagnostic mode has been invoked.
The Seek Check Count counts all occurrences of a seek error
whether or not recovery was successful.
This information is
available only from error logging, since seek errors are normally
recovered without notifying the host.
500504-00
6-27
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