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Command Specifications
a.
Cylinder count
This parameter specifies the total number of cylinders configured in the user
space on the disk media. This value includes the number of cylinders for
alternate blocks specified in the "Alternate Track Count/Drive" parameter of
the format parameters (Page code = 3).
It is impossible to change this parameter.
b.
Number of heads
This parameter indicates the number of data Read/Write heads in the disk
drive. It is impossible to change this parameter. If zero or a value which
differs from the "Default" value is specified in this parameter field, the IDD
performs rounding processing of the parameter, setting a value which is the
same as the default value in it.
c.
Bytes 6 to 16
The parameter defined in bytes 6 to 16 of this page descriptor is a parameter
that it is clearly not necessary for the INIT to specify. The IDD disregards
the values specified in this field.
d.
RPL (rotational position locking)
These bits are used for rotational synchronization of the disk and can be
specified. The IDD disregards the value specified in this field.
e.
Rotational synchronization offset
This is a field which specifies the offset value used for rotational
synchronization of the disk, but it is not supported in the IDD. The IDD
disregards the value specified in this field.
f.
Rotational speed
This specifies the disk's rotational speed in rpm (rotations/minute). This
parameter cannot be changed by the INIT. The IDD disregards the value
specified in this field and operates according to the "Default" value.
4-42
C141-C009
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