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C141-E124-01EN 4 - 5
h. DCR (disable correction)
"1" : Even when a correctable data check has been detected, data correction according to the
ECC is prohibited. However, On-the-fly correction processing is not prohibited.
"0" : When a correctable data check has been detected, data correction according to the ECC
is applied.
The IDD disregards this bit and operates according to the default value (=0).
i. Number of retries during read
This parameter specifies the number of retries that should be executed for "Data Check" type
errors detected in read operations on the disk media. The number of retries specified in this
parameter is the maximum number of times reading is retried for each individual portion of
data in each logical data block. If the IDD cannot perform correction of the data On-the-fly for
each portion of data in the data block, it retries the reading of those portions. The reread retry
is executed the number of times specified by the drive parameter internally by the IDD before
this retry is executed, so actually the retry is executed the number specified here plus the
number of internal retries.
The value specified in this parameter is applicable to the READ/READ EXTENDED
commands and the read test in the SEND DIAGNOSTIC command.
When the page length in Page 1 is specified as X '06,' the value specified in this field is copied
to the "Number of retries during WRITE" on this page and "Number of retries during
VERIFY" on Page 7.
j. Correctable bit length
This parameter indicates the burst error length (bit length) which it is possible to apply data
correction according to the ECC to. It is impossible to change this parameter from the INIT.
The IDD disregards the value specified in this parameter and operates according to the
"Default" value.
k. Head offset count (not supported)
This field specifies in two's-complement notation an incremental offset position from the track
center to the radial position the heads are moved. Any value specified in this field does not
preclude the device server from using positive or negative head offset during error recovery.
However, after any error recovery is completed the device server returns the head offset to the
value specified in this field.
The IDD is not supported this field. Therefore, the IDD ignores the specified value in this
field.