IBM IC35L036UWDY10 Hard Drive Specifications - Page 104

Mode Read/Write Error Recovery Parameters, Data Strobe Offset Count Ignored

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8.8.3 Mode Page 1 (Read/Write Error Recovery Parameters) Byte 0 1 2 3 4 5 6 7 8 9 10 11 Bit 7 6 5 4 3 2 1 PS RSVD=0 Page Code = 01h Page Length = 0Ah AWRE ARRE TB RC EER=0 PER DTE Read Retry Count Correction Span (Ignored) Head Offset Count (Ignored) Data Strobe Offset Count (Ignored) Reserved Write Retry Count (MSB) Reserved Recovery Time Limit 0 DCR (LSB) Default 81h 0Ah C0h 01h 00h 00h 00h 00h 01h 00h 00h 00h Figure 88. Mode Page 1 (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) of one indicates that the drive performs automatic reallocation of defective data blocks during write operations. AWRE of zero indicates that the drive will not perform automatic reallocation of defective data blocks during write operations. ! ARRE (Automatic Read Reallocation Enabled) of one indicates that the drive performs automatic reallocation of defective data blocks during read operations. ARRE of zero indicates that the drive will not perform automatic reallocation of defective data blocks during read operations. ! TB (Transfer Block) of one indicates that a data block that is not recovered by ERP is transferred to the initiator before CHECK CONDITION status is returned. TB of zero indicates that such a data block will not be transferred to the initiator. Data blocks that can be recovered are always transferred regardless of the value of TB. ! RC (Read Continuous) of one requests the drive to transfer the entire requested length of data without adding delays which would increase or ensure data integrity. This implies that the drive may send erroneous data. This bit has priority over all other error control bits (PER, DTE, DCR, TB). RC of zero indicates normal interpretation of PER, DTE, DCR, and TB values. The RC setting is used by the drive when reporting errors associated with the transfer of the Initiator's data for READ (6) and READ (10) commands: Note: The drive 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 ERP steps are taken which result in considerable recovery action. ! EER (Enable Early Recovery) must be set to zero, indicating that the drive uses ERP that minimizes the risk of misdetection or miscorrection during the data transfer. Ultrastar 146Z10 hard disk drive specifications 88

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8.8.3 Mode Page 1 (Read/Write Error Recovery Parameters)
00h
11
00h
(MSB)
Recovery Time Limit
(LSB)
10
00h
Reserved
9
01h
Write Retry Count
8
00h
Reserved
7
00h
Data Strobe Offset Count (Ignored)
6
00h
Head Offset Count (Ignored)
5
00h
Correction Span (Ignored)
4
01h
Read Retry Count
3
C0h
DCR
DTE
PER
EER=0
RC
TB
ARRE
AWRE
2
0Ah
Page Length = 0Ah
1
81h
Page Code = 01h
RSVD=0
PS
0
0
1
2
3
4
5
6
7
Default
Bit
Byte
Figure 88. Mode Page 1 (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) of one indicates that the drive performs automatic re-
allocation of defective data blocks during write operations. AWRE of zero indicates that the drive will
not perform automatic reallocation of defective data blocks during write operations.
!
ARRE
(Automatic Read Reallocation Enabled) of one indicates that the drive performs automatic re-
allocation of defective data blocks during read operations. ARRE of zero indicates that the drive will
not perform automatic reallocation of defective data blocks during read operations.
!
TB
(Transfer Block) of one indicates that a data block that is not recovered by ERP is transferred to
the initiator before CHECK CONDITION status is returned. TB of zero indicates that such a data block
will not be transferred to the initiator. Data blocks that can be recovered are always transferred
regardless of the value of TB.
!
RC
(Read Continuous) of one requests the drive to transfer the entire requested length of data without
adding delays which would increase or ensure data integrity. This implies that the drive may send
erroneous data. This bit has priority over all other error control bits (PER, DTE, DCR, TB). RC of zero
indicates normal interpretation of PER, DTE, DCR, and TB values. The RC setting is used by the drive
when reporting errors associated with the transfer of the Initiator's data for READ (6) and READ (10)
commands:
Note:
The drive 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 ERP steps are taken which result in considerable recovery action.
!
EER
(Enable Early Recovery) must be set to zero, indicating that the drive uses ERP that minimizes
the risk of misdetection or miscorrection during the data transfer.
Ultrastar 146Z10 hard disk drive specifications
88