Command Processing
reached the normal rotating speed, or if reading of system information is still in progress, a CHECK CONDITION status is reported as in item (1).
(3)Operation if formatting is not completed normally
While the FORMAT UNIT command is not being executed after a change in data format related parameters by the MODE SELECT command, if 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
1.7.5Error recovery processing
If an error is detected an recoverable error on the SCSI bus or internally in the IDD, 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 by 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 TARGET RESET message), the saved parameters are read and the error recovery processing procedures is initialized.
See Section 3.1.5 “MODE SELECT” and Section 3.1.6 “MODE SELECT EXTENDED” for details of the MODE SELECT or MODE SELECT EXTENDED command. See Section 5.3 “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.
(1)Recovery processing for errors on SCSI bus
The IDD performs the error recovery for SCSI bus errors, except for errors detected on DATA phase. However, if some kinds of errors (e.g. a critical error related to SCSI bus protocols) are detected, the IDD may transfer the SCSI bus forcibly to the BUS FREE phase and clear the command that is currently being executed.
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