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C141-E124-01EN
(2) FORMAT UNIT command
Issue the FORMAT UNIT command in either of the following two formats and initialize the entire
disk media surface.
a) Specify "1" in the "FmtData" bit, "0" in the "CmpLst" bit and "000" in the "Defect List
Format" field. Also, prepare only a 4-byte header, specify "0" in the "FOV," "DPRY,"
"DCRT" and "STPF" bits and zero in the "Defect List Length" field.
x In this FORMAT UNIT command, the entire disk media surface is initialized using the P
List and the previously existing G List, then after initialization, the data blocks are
verified. If any defective blocks are detected in the Verify operation, alternate blocks are
allocated for those data blocks. Also, the previously existing G List is saved, and the
defect position information for the defective data blocks detected in the Verify operation
is added to the G List. During initialization, alternate blocks for which sector slip
processing was applied for previously known defects are reallocated, so optimization of
the logical data block locations on the disk media can be expected.
b) Specify "0" in the "FmtData" bit and in the "CmpLst" bit and "000" in the "Defect List
Format" field. In this case, specification of the format parameters is not necessary.
x In this FORMAT UNIT command, the disk media is initialized using only the P List, then
after initialization, the data blocks are verified. If any defective blocks are detected in the
Verify operation, alternate blocks are allocated for those data blocks. Also, the
previously existing G List is erased and defect position information for the defective data
blocks detected in the Verify operation is recorded in a new G List.