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h.
DCR (disable correction)
"1": Even when a correctable data check has been detected, data correction
"0": When a correctable data check has been detected, data correction
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.
C141-C009
according to the ECC is prohibited. However, On-the-fly correction
processing is not prohibited.
according to the ECC is applied.
4.1 Control/Sense Commands
4-29
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