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b.
Parameters specifying track format (bytes 10, 11)
−
c.
Parameters specifying sector format (bytes 12 to 19)
−
−
−
C141-C009
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.
Data byte length/physical sectors
This parameter specifies the data length per 1 physical sector as the
number of bytes. In the IDD, the data byte length per 1 physical sector is
the same as the data byte length in 1 logical data block. The INIT can
specify the value of this parameter at 0 or 512 to 528 bytes (4-byte
boundary).
If a value less than 512 bytes, the IDD sets a byte length of 512. If more
than 528 bytes is specified, the IDD performs rounding processing and
sets a byte length of 528. If an odd number of bytes is specified within
the specified range, the IDD performs rounding up processing. If the
above rounding processing is performed, the IDD reports the CHECK
CONDITION status (RECOVERED ERROR [=1] / Rounded parameter
[37-00]) for that command.
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.
When both this page descriptor and the block descriptor are specified by
the same MODE SELECT command, and a nonzero value is specified in
this parameter which differs from the value in the "Data block length"
parameter in the block descriptor, the value specified in the block
descriptor has priority.
Interleave factor
This parameter field has meaning only with the MODE SENSE and
MODE SENSE EXTENDED commands. The interleave factor (in the
IDD, 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.
4.1 Control/Sense Commands
4-39
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