Caching Page (08 H ) - Seagate MEDALIST 1080SL Product Manual

88 Medalist 1080sl SCSI Product Manual, August 1995
When EER is set to zero, the target shall use an error
recovery procedure that minimizes the risk of misdetection
or miscorrection.
When the post error (PER) bit is set to one, the target shall
not report recovered errors. Error recovery procedures shall
be performed within the limits established by the error
recovery parameters.
When the disable transfer or error (DTE) bit is set to one,
the target shall terminate the data phase upon detection of
a recovered error. When DTE is set to zero, the target shall
not terminate the data phase upon detection of a recovered
error.
When the disable correction (DCR) bit is set to one, error
correction codes shall not be used for data error recoverry.
When DCR is zero, error correction codes can be used for
data recovery.
Byte 3 The verify retry count field specifies the number of times the
target attempts its recovery algorithm during a verify opera-
tion. If the verify retry count and the verify recovery time-limit
are both specified, the one that requires the least amount
of time for data error recovery actions shall have priority.
Byte 4 The verify correction span field specifies the size, in bits, of
the largest burst data-error for which data-error correction
may be attempted. If the target area does not implement
this field, a value of zero is returned in Mode Sense data.
Byte 5–9 Reserved
Byte 10–11 The verify recovery time limit field specifies in increments
of one millisecond the maximum time duration that the
target drive shall use error recovery procedures to recover
data for an individual logical block. This value may be
rounded as defined in Parameter Rounding. If the verify
retry count and the verify recovery time-limit are both speci-
fied, the one that requires the least amount of time for data
error recovery actions shall have priority.
Note. To disable all types of correction and retries, the initiator should
set the EER bit to zero, the PER, DTE and DCR bits to one and
the number of retries and recovery time limit to zero.
C.6 Caching page (08
The drive uses read look-ahead, read caching and write caching to
improve seek times and performance.
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