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SCSI Interface Product Manual, Rev. B
Table 149.
Rigid Drive Geometry Parameters page (04h) (continued)
Bit
7
Byte
20
(MSB)
21
Changeable [8]
0
22
Default
Changeable [8]
0
23
Default
Changeable [8]
[1]
The Parameter Savable (PS) bit of 1 indicates that page 04 parameter data is savable and is saved when
a Format Function is performed. In some drives an exception exists that applies to bytes 17 and 18. In the
exception drives, bytes 17 and 18 are only saved if the SMP bit in the MODE SELECT command (Table
135) is 1. See individual drive's Product Manual, Volume 1, "SCSI bus conditions and miscellaneous fea-
tures supported." This PS bit is not applicable to the MODE SELECT command.
[2]
The NUMBER OF CYLINDERS field defines the number of physical cylinders used for data storage. This
may or may not include spare cylinders set aside for flaw reallocation. See individual drive's Product Man-
ual, Volume 1, which specifies what the drive reports.
The drive uses some additional cylinders for storing drive parameters, defect lists, or for diagnostic pur-
poses. These are not accessible by the user.
[3]
The NUMBER OF HEADS field indicates the maximum number of data (read/write) heads on the drive.
[4]
Not applicable.
[5]
Used for Spindle Synchronization (rotational position locking).
Rotational Position Locking
RPL
Description
00b
Indicates that spindle synchronization is automatic. (Automatic master arbitration is used to
determine which device in the chain is to be master.)
01b
The target operates as a synchronized-spindle slave.
10b
The target operates as a synchronized-spindle master.
11b
The target operates as a synchronized-spindle master control (not supported by drive).
[6]
Rotational skew in the lagging direction used for spindle synchronization. The value XXh given represents
a XXh/FFh fractional part of a revolution lagging offset. One revolution lag is maximum. See section on
Synchronous Spindle Operation in individual drive's Product Manual, Volume 1.
[7]
On MODE SENSE command, these bytes return drive nominal rotation rate in revolutions per minute for
synchronous spindle operation. The bytes have no meaning for MODE SELECT.
[8]
See individual drive's Product Manual, Volume 1, MODE SENSE Data section, for changeable values.
6
5
MEDIUM ROTATION RATE [7]
0
0
0
0
4
3
0
0
Reserved
0
0
Reserved
2
1
(LSB)
0
0
0
0
213
0
0
0
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