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Operation if Formatting is Not Completed Normally
If, while the FORMAT UNIT command is not being executed following a change in data
format related parameters by the MODE SELECT command, the FORMAT UNIT command
is terminated abnormally for any reason (Example: power cut off or RESET condition), the
data on the disk media cannot be accessed normally. In this case, the IDD reports a CHECK
CONDITION status for the command accessing the disk media.
The sense data generated at this time indicate a MEDIUM ERROR [=3] / Medium format
corrupted [=31-00] in the case of the former and MEDIUM ERROR [=3] / FORMAT
command failed [=31-01]. In either case, the IDD is restored to the ready state by
reinitializing the disk media using the FORMAT UNIT command.
1.7.5
Error Recovery Processing
If an error is detected on the SCSI bus or internally in the IDD which can be retried, the IDD
attempts recovery processing of the detected error during command execution.
The INIT can specify detailed parameters related to error recovery processing and whether or
not there is a report for errors which were successfully recovered from using the MODE
SELECT or MODE SELECT EXTENDED command. It can also save those parameters in
accordance with INIT specifications in the system space on the disk media, and can change
them temporarily without saving them. After the power is switched on, or after a reset
(RESET condition or BUS DEVICE RESET message), the saved parameters are read and the
error recovery processing procedures is initialized.
See 3.1.5 “MODE SELECT” and 3.1.6 “MODE SELECT EXTENDED” for details of the
MODE SELECT or MODE SELECT EXTENDED command. See 4.3 “Disk Drive Error
Recovery Processing” and Chapter 3, “SCSI Bus Error Recovery Processing” of “SCSI
Physical Interface Specifications” for details of error recovery processing.
An outline of error recovery processing executed by the IDD is shown below.
