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Parameter Data Format
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
HDD'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 HDD 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 HDD, this
parameter indicates the number of spare sectors secured in each cell.
This parameter cannot be changed by the INIT.
− 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 HDD 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 HDD, 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 HDD. This parameter cannot be changed
by the INIT.
290 C141-C013