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c. Drive parameter (page code = 4)
To explicitly specify the number of cylinders in the user space, specify the number in the
"number of cylinders" field. Note that the number of alternate cylinders specified by the
format parameter (page code = 3) is included in the number of cylinders in the user space.
When the number of cylinders need not be specified, specify 0 or the default value in the
"number of cylinders" field. In this case, either of the smaller value between the number of
cylinders to allocate the number of logical data blocks specified in the "number of data
blocks" field of the block descriptor or the maximum number of cylinders that can be used as
the user space on the disk drive is allocated in the user space. When 0 is specified both in the
"number of cylinders" field and the "number of data blocks" field of the block descriptor, the
maximum number of cylinders that can be used as the user space on the disk drive is
allocated in the user space.
(2)
FORMAT UNIT command
Initialize all sides of the disk with the FORMAT UNIT command.
command initializes all sides 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.
5.4.4
Setting parameters
The user can specify the optimal operation mode for the user system environments by setting the
following parameters with the MODE SELECT or MODE SELECT EXTENDED command:
•
Error recovery parameter
•
Disconnection/reconnection parameter
•
Caching parameter
•
Control mode parameter
With the MODE SELECT or MODE SELECT EXTENDED command, specify 1 for the "SP" bit
on CDB to save the specified parameter value on the disk. This enables the IDD to operate by
using the parameter value set by the user when power is turned on again. When the system has
more than one INIT, different parameter value can be set for each INIT.
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C141-E078-02EN
The FORMAT UNIT
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