Maxtor 10K V - Manual (Page 128)

5-70 Maxtor Atlas 10K V
Table 5-97
Rigid Disk Geometry Page-Field Descriptions (Page 4)
Field Description
PS
Parameters Savable. This bit is only used with the MODE SENSE com-
mand. A returned value of 1 indicates that the target is capable of saving the
page in a non-volatile, vendor-specific location. The bit is reserved with the
MODE SELECT command.
Number of Cylinders The number of physical cylinders that hold host data.
Number of Heads The number of heads that can access host data.
Starting Cylinder The value in this field is the physical cylinder at
Write
Precompensation
which write precompensation is to begin. The first cylinder number is 0. If
the starting cylinder is equal to the value in the Number of Cylinders field,
write precompensation is disabled.
Starting Cylinder
Reduced Write
Current
The value in this field is the physical cylinder at which write current is re-
duced. The first cylinder number is 0. If the starting cylinder for reduced
write current is equal to the value in the Number of Cylinders field, reduced
write current is disabled.
Drive Step Rate Applies to stepper-motor actuators. Not applicable.
Landing Zone
Cylinder
This field indicates a two’s complement location where the drive positions
the disk heads. A negative value indicates that the heads are positioned be-
low cylinder 0 by that number of cylinders. A positive value greater than the
number of cylinders indicates that the heads are positioned beyond the cyl-
inders used for data storage at the location specified.
RPL
Rotational Position Locking is used for spindle synchronization in storage
arrays. The modes are:
00b – Disabled
10b – Master
01b – Slave
11b – Not supported
RPL can be overridden if the Maxtor (Vendor) Special Function Control
page Auto field value = 1. This drive does not support spindle synchroniza-
tion.
Rotational Offset
Rotational Offset indicates the amount of rotational offset that the drive
uses when synchronized. The rotational offset is applied in the retarded di-
rection (lagging the synchronized spindle master). The value in the field is
determined by the following formula:
Offset = 0 … 255
256
For example, a numerator of 128 indicates an offset of 1/2 revolution
(180°).
The valid parameter values are 0 to 255.
The specified value may be rounded. Rotational offset is not used when the
drive is configured as the synchronized-spindle master.
Medium Rotation Rate The disk rotation speed in RPM.