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Command Specifications
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d.
Parameters related to device type (byte 20)
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−
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4-40
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 Product Manual for details about track skew. 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.
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
Product Manual for details about cylinder skew. 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.
SSEC (soft sectoring)
When this bit is "1," it indicates that the data formatting method on the
disk media is "soft sectoring." However, since the IDD uses only the
"hard sectoring" method (refer to previously shown item b), this bit is
disregarded. Furthermore, it is impossible to change this parameter.
HSEC (hard sectoring)
When this bit is "1," it indicates that the data formatting method on the
disk media is "hard sectoring." However, since the IDD uses only the
"hard sectoring" method, this bit is disregarded. Furthermore, it is
impossible to change this parameter.
RMB (removable medium)
When this bit is "1," it indicates that the storage media of the disk drive
can be replaced. When this bit is "0," it indicates that the storage media
is fixed. However, since the IDD has a fixed media, this bit is
disregarded. Furthermore, it is impossible to change this parameter.
SURF (surface addressing)
When this bit is "1," it indicates that after logical data block address
allocation is performed over all the sectors in order on the same memory
surface (same head), it is proceeding to the next memory surface (next head)
after all the sectors have been done. When this bit is "0," it indicates that
after logical data block address allocation is performed over all the sectors in
order in the same cylinder (all heads), it is proceeding to the next cylinder. In
the IDD, only the latter type of addressing is possible, so this bit is
disregarded. It is also impossible to change this parameter.
C141-C009
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