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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 6~16 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 as
shown below.
RPL bit
No rotational synchronization is performed.
0
0
The IDD synchronizes rotation to an external master signal (Slave).
0
1
The IDD outputs the master signal for synchronizing rotation externally.
1
0
(Master)
Not used.
1
1
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.
Operation
C141-E039-01EN
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