Quantum 10K II - Manual (Page 133)

SCSI Description
5–66 Quantum Atlas 10K II Ultra160/m SCSI Hard Disk Drives
MODE SELECT (6) Command (15h) (continued)
Table 5–33 Read-Write Error Recovery Page — Field Descriptions
Default
Field Value Description
PS 1 Parameters Savable. This bit is only used with the MODE SENSE
command. A returned value of 1 indicates that the target is capable of
saving the page in a non-volatile, vendor-specific location. The bit is
reserved with the MODE SELECT command
AWRE 1 Automatic Write Reallocation Enable. When the value is 1, it causes the
drive to automatically reallocate bad sectors encountered during a write
operation. If it succeeds in replacing the bad sector, the drive adds the
revectored sector’s Logical Block Number to the Grown Defect List.
Reallocation is done only when the drive is able to recover the sector’s
data unless the Reallocate Uncorrected Errors bit of the Quantum
(Vendor) Special Function Control Page is set.
When AWRE is 0, the drive does not automatically reallocate bad sectors
encountered during a write operation. See also Quantum-Unique Page
39h.
ARRE 1 Automatic Read Reallocation Enable. When the value is 1, it causes the
drive to automatically reallocate bad sectors encountered during a read
operation. If it succeeds in replacing the bad sector, the drive adds the
revectored sector’s Logical Block Number to the Grown Defect List.
Reallocation is done only when the drive is able to recover the sector’s
data unless the HrdBBR bit of the Quantum (Vendor) Special Function
Control Page is set.
When ARRE is 0, the drive does not automatically reallocate bad sectors
encountered during a read operation. See also Quantum-Unique Page
39h (RUEE).
TB 0 Transfer Block. When the value is 1, the drive sends best-guess
information to the initiator when it encounters a defective sector whose
data cannot be fully recovered.
When the value is 0, data that cannot be fully recovered is not returned
to the initiator.
RC 0 Read Continuous. When the value is 0, the drive attempts error recovery
when it encounters an error. When the value is 1, the drive suppresses
error recovery. The drive ignores any value placed in this field.
EER 0 Enable Early Recovery. Not supported by the drive.
PER 0 Post Error Recovery. When the value is 0, the drive returns a GOOD
status in cases where error recovery is invoked and successful.
When the value is 1, the drive returns a CHECK CONDITION status for
recovered errors, sets the sense key to RECOVERED ERROR, and posts
the appropriate additional sense key.
DTE 0 Disable Transfer on Error. Not supported by the drive.
DCR 0 Disable Correction. When the value is 0, ECC correction is applied as a
means of recovering erred data. On write operations, a valid ECC is
written to each data sector regardless of the value in the DCR bit.
When the value is 1, ECC correction is disabled (but not retries or
reads), and ECC errors cannot be corrected. However, on-the-fly is
always enabled.