Hitachi Ultrastar 15K147 SCSI Hard Disk Drive Specification
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17.10.7 Mode Page 07 (Verify Error Recovery Parameters)
Table 81: Mode Page 07 (Verify Error Recovery Parameters)
The Verify recovery parameters are used by the Target when recovering from and reporting errors associated with the verifica-
tion of the Initiator's Data for the following commands:
• VERIFY
• WRITE AND VERIFY - the verify portion of the command only.
Since bytes 4-11 are not changeable, the Mode Select Commands accepts only the values indicated for bytes 4 - 11.
•
EER
. This bit is 0 since the Target does not support early recovery.
•
PER
. See below for description of bit values.
•
DTE
. This bit is 0 since the Target always continues on recovered verify operation errors.
•
DCR
. See below for description of bit values.
PER, DTE, and DCR bit settings in page 7 override those of page 1 during VERIFY and the Verify portion of WRITE AND
VERIFY. There are only four valid conditions for the PER, DTE, and DCR bits. All other combinations return
Check Condi-
tion
status.
PER DTE DCR DESCRIPTION
0 0 0
Soft errors are not reported. ECC is applied to recover the data.
1 0 0
Soft errors are reported. ECC is applied to recover the data.
0 0 1
Soft errors are not reported. ECC is not used to recover the data.
1 0 1
Soft errors are reported. ECC is not used to recover the data.
•
Verify Retry Count
sets a limit on the amount of verify recovery procedure (VRP) passes the Target attempts when
recovering verify errors. The Verify Retry Count of one causes the Target to attempt up to one VRP pass per com-
mand when a medium error occurs during a verify operation. Only values of 0h and 01h are valid. The value of 0h
disables all recovery.
•
Verify Correction Span
field specifies the size in bits of the largest data error burst for which data error correction may
be attempted. The field can be set to any value but the drive will not use off-line correction during verify operations.
•
Verify Recovery Time Limit
indicates the period in 1 millisecond increments for the maximum recovery time of a sin-
gle LBA during the verify operation. The value must be from 40 ms to 65535 ms (65.5 seconds). The granularity of
the timer is 50 ms. If an LBA is not able to be recovered within the limit, a Check Condition will be returned. A
value of zero disables the timer.
Byte
Bit
7
6
5
4
3
2
1
0
Default
0
PS
0
Page Code = 07h
87h
1
Page Length = 0Ah
0Ah
2
Reserved = 0
EER=0
PER
DTE=0
DCR
00h
3
Verify Retry Count
01h
4
Correction Span = 00h
00h
5
Reserved = 0
00h
6
Reserved = 0
00h
7
Reserved = 0
00h
8
Reserved = 0
00h
9
Reserved = 0
00h
10-11
(MSB) Verify Recovery Time Limit
(LSB)
00h
Summary of Contents for HUS151414VL3600
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