Fujitsu MAN3184 Manual Do Utilizador
C141-E124-01EN
5 - 25
(3)
Correctable data read error
This error is a correctable ECC error when data are being read. Processing methods when this
error is detected differ depending on the values specified in the EER flag and DCR flag in the
MODE SELECT parameters.
error is detected differ depending on the values specified in the EER flag and DCR flag in the
MODE SELECT parameters.
If immediate correction of errors is permitted (DCR = 0, EER = 1), the IDD immediately makes
error corrections in the data buffer and sends the corrected data to the INIT. Also, in the case of
Verify processing, at the point when it judges that correction is possible, it regards verification as
being successful and continues processing of subsequent data blocks.
error corrections in the data buffer and sends the corrected data to the INIT. Also, in the case of
Verify processing, at the point when it judges that correction is possible, it regards verification as
being successful and continues processing of subsequent data blocks.
If error correction is permitted but immediate correction is not permitted (DCR = 0, EER = 0),
reading of data as in item (2) is retried up to the number of times specified in the other MODE
SELECT parameters ("Number of Retries during Read" or "Number of Retries during Write").
reading of data as in item (2) is retried up to the number of times specified in the other MODE
SELECT parameters ("Number of Retries during Read" or "Number of Retries during Write").
If error correction is prohibited (DCR = 1, EER = 0), reading of data as in item (2) is retried up to the
number of times specified in "Number of Retries during Read" or "Number of Retries during Write."
number of times specified in "Number of Retries during Read" or "Number of Retries during Write."
If the error cannot be recovered from even when this retry processing is executed, the IDD
terminates the command that is currently being executed with a CHECK CONDITION status. The
sense key in the sense data at this time is "MEDIUM ERROR [=3]" and the sense code indicates
"Unrecovered read error [=11-00]."
terminates the command that is currently being executed with a CHECK CONDITION status. The
sense key in the sense data at this time is "MEDIUM ERROR [=3]" and the sense code indicates
"Unrecovered read error [=11-00]."
(4)
Other internal IDD errors
If an irrecoverable error other than those in items (1) to (3) above is detected internally in the IDD, the
IDD terminates the command that is currently being executed with a CHECK CONDITION status. The
sense key in the sense data at this time is "HARDWARE ERROR [=4]."
IDD terminates the command that is currently being executed with a CHECK CONDITION status. The
sense key in the sense data at this time is "HARDWARE ERROR [=4]."
5.3.2
Auto alternate block allocation processing
The IDD is equipped with a function which automatically executes alternate block allocation
processing for defective data blocks detected during execution of the READ and READ
EXTENDED commands.
processing for defective data blocks detected during execution of the READ and READ
EXTENDED commands.
(1)
Auto alternate block allocation processing during a read operation
This function is enabled by specifying "1" in the ARRE flag in the MODE SELECT parameters.
Furthermore, this function is applicable to the following commands only.
Furthermore, this function is applicable to the following commands only.
• READ command
• READ EXTENDED command
• READ EXTENDED command
When this function is permitted, if, during read processing to the data area, an error which is an object of
retry processing is detected, and which it is impossible to recover from even when reading is retried (see
Section 5.3.1 (2)) the number of times specified in the "Number of Retries during Read" field in the
MODE SELECT parameters, the IDD allocates an alternate block for that data block and executes
copying of the alternate block to the data area. Alternate block allocation processing is the same as
processing with the REASSIGN BLOCKS command. Furthermore, recovered data copied to the
alternate block are data which are read out, skipping the ID area, if there is an ID area, or they are data
which have been corrected through the ECC.
retry processing is detected, and which it is impossible to recover from even when reading is retried (see
Section 5.3.1 (2)) the number of times specified in the "Number of Retries during Read" field in the
MODE SELECT parameters, the IDD allocates an alternate block for that data block and executes
copying of the alternate block to the data area. Alternate block allocation processing is the same as
processing with the REASSIGN BLOCKS command. Furthermore, recovered data copied to the
alternate block are data which are read out, skipping the ID area, if there is an ID area, or they are data
which have been corrected through the ECC.