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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.
The INIT must not recognize the defective data blocks included in
the P List as normal data 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.
(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.
a.
Read/Write Error Recovery Parameters (Page 1)
−
−
−
−
−
b.
Verify Error Recovery Parameters (Page 1)
−
−
c.
Caching Parameters (Page 8)
−
(2) Writing a data pattern
Write a data pattern for verification in the data block which is the object. The
recommended data pattern at this time is X '0123456789ABCDEF' repeated. The
WRITE, WRITE EXTENDED or WRITE SAME command can be used to write
data.
C141-C009
6.3 Data Block Verification Methods (Recommended)
AWRE = 0, ARRE = 0
TB = 0
EER = 0, PER = 1, DTE = 1, and DCR = 1
Number of Retries during Read = Zero
Number of Retries during Write = Zero
EER = 0, PER = 1, DTE = 1, and DCR = 1
Number of Retries during Verify = Zero
RCD = 1
6-7
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