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5.3 Disk Drive Error Recovery Processing
C141-E167 5 - 25
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. See the description of the MODE SELECT command (Section 3.1.5)
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)