Error Recovery Processing Control - Fujitsu MAX3073NC - SCSI,80, Dell DC961,Hard Drive Scsi Logical Interface Specifications

Sense Data Error Recovery Methods
Sectors to be made AWRE shall be following:
• the sector where the error occurs and the latter sectors and,
• the sectors whose data are logically continual and stored in Cache,
• the sectors which will be processed in this Write command and,
• the sectors which locate between erroneous Servo –1 and +1 (including Split sector)
This function is also applied for the sector which has already been re-assigned.
Remark:
1. When a write protection is prohibitted through the setting terminal, the auto alternate block
allocation processing specification is disabled.
5.3.3

Error recovery processing control

The INIT can, by specifying the MODE SELECT parameters, can control the error recovery processing
(retries) of the IDD with respect to each type of error related to the disk drive.
Table 5.5 shows the types of error and the method of specifying the number of retries for those errors.
for those items where the INIT can specify the number of retries, normally, it is recommended that the
default value or a greater number of times be specified. If a value smaller than the default value is
specified, and commands are terminated abnormally without error recovery processing succeeding, the
INIT should reset the corresponding MODE SELECT parameters at the default value, then reexecute the
original commands.
The MODE SELECT parameters related to disk drive error recovery processing which the INIT can
specify are shown below.
concerning details of the functions of each parameter. The INIT can issue the MODE SELECT or
MODE SELECT EXTENDED command as necessary and select the error recovery flags and the number
of retries.
a. Read/Write Error Recovery Parameters (Page Code = 1)
•
AWRE (automatic write reallocation enabled)
•
ARRE (automatic read reallocation enabled)
•
TB (transfer block)
•
EER (enable early recovery)
•
PER (post error)
•
DTE (disable transfer on error)
•
DCR (disable correction)
•
Number of retries during read (See Table 5.5)
•
Number of retries during write (See Table 5.5)
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See the description of the MODE SELECT command (Section 3.1.5)
C141-C010