Hitachi Ultrastar 15K450 (FC-AL) Hard Disk Drive Specification
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19.10.3 Mode Page 01 (Read/Write Error Recovery Parameters)Table 148:Mode Page 01 (Vendor Unique Parameters)
The Read-Write recovery parameters that will be used during any command that performs a read or write operation to the
medium are as follows:
•AWRE Automatic Write Reallocation Enabled bit, set to zero indicates that the drive shall not perform automatic reallo-
cation of defective data blocks during write operations. An AWRE bit set to one indicates that the drive shall perform
automatic reallocation of defective data blocks during write operations.
•ARRE Automatic Read Reallocation Enabled bit, set to zero indicates that the drive shall not perform automatic reallo-
cation of defective data blocks during read operations. ARRE bit set to one indicates that the drive shall perform
automatic reallocation of defective data blocks during read operations.
•TB Transfer Block bit, set to one indicates that a data block that is not recovered within the recovery limits specified
shall be transferred to the Initiator before Check Condition status is returned. A TB bit set to zero indicates that such
a data block shall not be transferred to the Initiator. Data blocks that can be recovered within the recovery limits are
always transferred regardless of the value of the bit.
•RC Read Continuous bit, set to one requests the Target to transfer the entire requested length of data without adding
delays that would increase or ensure data integrity. This implies that the Target may send erroneous data. This bit has
priority over all other error control bits (PER, DTE, DCR, TB). RC set to zero indicates normal interpretation of
PER, DTE, DCR, and TB values. The RC bit setting is used by the Target when reporting errors associated with the
transfer of the Initiator's data for the Read commands interpretation of PER, DTE, DCR, and TB values. The RC bit
applies only to READ commands.
Note: The Target implementation of the RC option is to disable error detection of the data fields but continue normal
error detection and recovery for errors occurring in the servo field. If a servo field failure occurs, normal DRP could
result in considerable recovery action, including proceeding through all levels of DRP.
•EER an Enable Early Recovery bit, must be set to zero, indicating that the drive shall use an error recovery procedure
that minimizes the risk of misdetection or miscorrection during the data transfer. Data shall not be fabricated.
Byte Bit
76543210Default
0 PS 0 Page Code = 01h 81h
1 Page Length = 0Ah 0Ah
2 AWRE ARRE TB RC EER=0 PER DTE DCR C0h
3 Read Retry Count 01h
4 Obsolete = 0 00h
5 Obsolete = 0 00h
6 Obsolete = 0 00h
7 Reserved 00h
8 Write Retry Count 01h
9 Reserved 00h
10
11
(MSB) Recovery Time Limit
(LSB)
00h