Fujitsu MAX3073NC - SCSI,80, Dell DC961,Hard Drive Scsi Logical Interface Specifications page 199

a. Parameters for specifying alternate processing areas for defective blocks (bytes 2 to 9)
The following 4 parameters specify the position and number of spare sectors for performing
defective block alternate allocation processing on the disk media. See Chapter 3, "Data Format" of
Product Manual for details of the IDD's alternate block processing.
•
Track count/zone
This parameter specifies the number of tracks a unit for alternating blocks. The INIT cannot
clearly specify this value. The IDD ignores the specification for this bit. If the value of the
Active Notch in Page C is 0, the "Number of tracks a cell" is reported for the MODE SENSE
and MODE SENSE EXTENDED commands.
If not, the total number of track of the zone which is specified as the Active Notch is reported.
•
Alternate sector count/zone
This parameter specifies the number of sectors per one cell as the number of spare sectors
secured for use as alternate blocks. In the IDD, this parameter indicates the number of spare
sectors secured in each cell. The maximum permissible value of this parameter either the
"number of physical sectors per track in the last cell - 1" or "240", whichever is smaller. It is
possible for the INIT to vary this parameter within a range of 0 to the maximum permissible
value. When a value which exceeds the maximum permissible value is specified, the IDD
performs rounding down of the parameter and sets a value equal to this parameter's maximum
permissible value. If the above rounding processing is performed, a CHECK CONDITION
status (RECOVERED ERROR
command.
•
Alternate track count / zone
This parameter specifies the area secured for alternate blocks as the number of tracks per one
cell. It is impossible to change this parameter. When a value other than zero is specified in this
field, the IDD performs rounding down processing of this parameter and always sets this
parameter value at zero.
•
Alternate track count / drive
This parameter specifies the area secured for alternate blocks as the number of tracks per disk
drive. In the IDD, this parameter indicates the number of tracks in the spare area secured as
alternate cells. This value is fixed at a value that equals the number of tracks per cylinder
multiplied by the number of zones in the IDD. This parameter cannot be changed by the INIT.
b. Parameters specifying track format (bytes 10, 11)
•
Sector count/track
This parameter specifies the number of physical sectors per 1 track. In the IDD, the number of
physical sectors in a track is set unilaterally according to the data format specified by the "Data
Block Length" parameter in the block descriptor or the "Data byte length/Physical sector"
parameter in this page descriptor, so this parameter cannot be changed. The IDD disregards the
value specified in this field. This parameter indicates the value of zone specified in Active
Notch of Page C. If it is 0, this parameter indicates the value in zone 0.
C141-C010
[= 1] / Rounded parameter
4.1 Mode Parameters
[37-00] is reported for that
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