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c. Parameters which Specify the 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.
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 (2-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. The IDD 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 "OEM Manual, Product Specifications/Installation
Procedure" for details about track skew. This parameter always indicates the value in
zone 0. Also, the "Default" value of this parameter indicates a value which matches
the current data format.
•
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 IDD 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 "OEM Manual,
Procedure" for details about cylinder skew. This parameter always indicates the value
in zone 0. Also, the "Default" value of this parameter indicates a value which
matches the current data format.
C141-E039-01EN
Product Specifications/Installation
3 - 39
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