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5-18 C141-E166
b. Format parameter (page code = 3)
Specify the number of spare sectors for each cell in the "alternate sectors/zone" field and
specify the number of tracks for alternate cylinders (= number of alternate cylinders × number
of disk drive heads) in the "alternate tracks/zone" field. It is recommended not to specify
values smaller than the IDD default value in this field.
(2) FORMAT UNIT command
Initialize all recording surface of the disk with the FORMAT UNIT command. The FORMAT
UNIT command initializes all surface of the disk using the P lists, verifies data blocks after
initialization, and allocates an alternate block for a defect block detected with verification. With
initialization, the value "00" is written into all bytes of all logical data blocks. Only the position
information of defect blocks detected with verification is registered in the G list. The
specifications are as follows:
a. Specifying CDB
Specify 0 for the "FmtData" bit and the "CmpLst" bit on CDB, 000 for the "Defect List
Format" field, and data pattern written into the data block at initialization for the "initializing
data pattern" field.
b. Format parameter
When the values in step a. are specified with CDB, the format parameter is not needed.