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Command Specifications
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.
−
−
−
−
4-38
Track count/zone (bytes 2 to 9)
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 Logic Heads 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.
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
[= 1] / Rounded parameter [37-00]) is reported for that 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.
C141-C009
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