Fujitsu MAN3735 Manuale Utente
C141-E124-01EN
6 - 7
6.3
Data Block Verification Methods (Recommended)
The recommended procedure for verifying from the INIT the normalcy of logical data blocks
located on the disk media is as shown below. It is desirable for the INIT to verify the data blocks
after initialization of the disk media is completed or when executing alternate block allocation
processing by the REASSIGN BLOCKS command.
located on the disk media is as shown below. It is desirable for the INIT to verify the data blocks
after initialization of the disk media is completed or when executing alternate block allocation
processing by the REASSIGN BLOCKS command.
Note:
The INIT must not recognize the defective data blocks included in the P List as normal data
blocks in the verification operation.
blocks in the verification operation.
After the INIT has written a specific data pattern for logical data blocks which is the object of
verification using the procedure described below, it next reads those data or verifies the data
blocks by executing Verify.
verification using the procedure described below, it next reads those data or verifies the data
blocks by executing Verify.
(1)
Setting parameters by the MODE SELECT command
Issue the MODE SELECT or the MODE SELECT EXTENDED command and prohibit retry
processing, data correction and operation of the Read-Ahead Cache feature. The necessary
parameter settings are as shown below.
processing, data correction and operation of the Read-Ahead Cache feature. The necessary
parameter settings are as shown below.
a.
Read/Write Error Recovery Parameters (Page 1)
x
AWRE = 0, ARRE = 0
x
TB = 0 or 1
x
EER = 0, PER = 1, DTE = 1, and DCR = 1
x
Number of Retries during Read = Zero
x
Number of Retries during Write = Zero
b. Verify Error Recovery Parameters (Page 1)
x
EER = 0, PER = 1, DTE = 1, and DCR = 1
x
Number of Retries during Verify = Zero
c. Caching Parameters (Page 8)
x
RCD = 1