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4.1 Mode Parameters
C141-E167 4 - 19
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.
4.1.5 Verify error recovery parameters (page code = 7)
The page descriptor format of this MODE SELECT parameter is shown in Figure 4.5.