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5.1 Mode Parameters
b. Parameters specifying track format (bytes 10, 11)
− Sector count/track
This parameter specifies the number of physical sectors per 1 track. In
the HDD, 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 HDD disregards the value specified in this field. This
parameter indicates the value of zone specified in Active Notch of Page C.
If it is 1, this parameter indicates the value in zone 0.
c. Parameters specifying sector format (bytes 12 to 19)
− Data byte length/physical sectors
This parameter specifies the data length per 1 physical sector as the
number of bytes.
If 0 is specified in this parameter, the value calculated based on the value
of the "Data block length" in the block descriptor is used as this
parameter value.
− Interleave factor
This parameter field has meaning only with the MODE SENSE and
MODE SENSE EXTENDED commands. The interleave factor (in the
HDD, this is always X '0001' :non interleave) of the disk drive's current
data format. The value specified in this field is disregarded in the MODE
SELECT and MODE SELECT EXTENDED commands.
− Track skew factor
This parameter indicates the number of physical sectors existing between
the data block with the highest order logical block address on a track and
the data block with the next logical block address on the next track of the
same cylinder (track skew). This parameter cannot be changed.
The HDD disregards the value specified in this field and sets the
optimum track skew value in the specified data block length. See
Chapter 3, "Data Format" in the Product Manual for details about track
skew. This parameter indicates the value of zone specified in active
notch of Page C. If it is 1, this parameter indicates the value in zone 0.
− Cylinder skew factor
This parameter indicates the number of physical sectors existing between
the data block with the highest order logical block address in a cylinder
and the data block with the next logical block address in the next cylinder
(cylinder skew). This parameter cannot be changed. The HDD disregards
the value specified in this field and sets the optimum cylinder skew value
in the specified data block length. See Chapter 3, "Data Format" in the
Product Manual for details about cylinder skew. This parameter indicates
the value of zone specified in active notch of Page C. If it is 1, this
parameter indicates the value in zone 0.
d. Parameters related to device type (byte 20)
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