User Manual

SCSI Commands Reference Manual, Rev. J 428
www.seagate.com Parameters for direct access devices
5.3.22 Read-Write Error Recovery mode page (01h)
The Read-Write Error Recovery mode page (see table 404) specifies the error recovery parameters the device server shall use
during any command that performs a read or write operation to the medium (e.g., READ commands, WRITE commands, and
WRITE AND VERIFY commands).
PS (Parameters Savable) bit
The parameters savable (PS) bit is only used with the MODE SENSE command. This bit is reserved with the MODE SELECT command. A PS bit set
to one indicates that the device server is capable of saving the mode page in a non-volatile vendor-specific location.
PAGE CODE field and PAGE LENGTH field
The PAGE CODE field and PAGE LENGTH field are described in 5.3.5.
AWRE (Automatic Write Reallocation Enabled) bit
0 An automatic write reallocation enabled (AWRE) bit set to zero specifies that the device server shall not perform automatic reallocation
of defective logical blocks during write operations.
1 An AWRE bit set to one specifies that the device server shall enable automatic reallocation of defective logical blocks during write oper-
ations. The automatic reallocation shall be performed only if the device server has the valid data (e.g., original data in a buffer or recov-
ered from the medium). The valid data shall be placed in the reallocated logical block. The device server shall report any failures that
occur during the reallocation operation. Error reporting as specified by the error recovery bits (i.e., the EER bit, the PER bit, the DTE bit,
and the DCR bit) shall be performed only after completion of the reallocation. See the REASSIGN BLOCKS command (see 3.28) for error
procedures.
ARRE (Automatic Read Reallocation Enabled) bit
0 An automatic read reallocation enabled (ARRE) bit set to zero specifies that the device server shall not perform automatic reallocation of
defective logical blocks during read operations.
1 An ARRE bit set to one specifies that the device server shall enable automatic reallocation of defective logical blocks during read opera-
tions. All error recovery actions required by the error recovery bits (i.e., the EER bit, the PER bit, the DTE bit, and the DCR bit) shall be pro-
cessed. The automatic reallocation shall then be performed only if the device server successfully recovers the data. The recovered data
shall be placed in the reallocated logical block. The device server shall report any failures that occur during the reallocation operation.
Error reporting as specified by the error recovery bits (i.e., the EER bit, the PER bit, the DTE bit, and the DCR bit) shall be performed only
after completion of the reallocation operation. See the REASSIGN BLOCKS command (see 3.28) for error procedures.
Table 404 Read-Write Error Recovery mode page
Bit
Byte
7 6 5 4 3 2 1 0
0 PS SPF (0b) PAGE CODE (01h)
1 PAGE LENGTH (0Ah)
2 AWRE ARRE TB RC
ERROR RECOVERY BITS
EER PER DTE DCR
3 READ RETRY COUNT
4 Obsolete
5 Obsolete
6 Obsolete
7 Reserved
Restricted
for MMC-6
8 WRITE RETRY COUNT
9 Reserved
10 (MSB)
RECOVERY TIME LIMIT
11 (LSB)