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Parameter Data Format
This parameter cannot be changed. The HDD disregards the specification in
this field.
l. Maximum pre-fetch ceiling
This parameter specifies the maximum quantity of logical data blocks pre-
fetched to the data buffer with the READ command or READ EXTENDED
command. In the HDD the maximum pre-fetch quantity cannot be limited.
This parameter cannot be changed. The HDD disregards the specification in
this bit and operates according to the "Default" value (= X 'FFFF').
m. DRA (disable read-ahead)
This bit specifies whether or not activate the read-ahead operation.
This bit cannot be changed. The HDD disregards the specification in this bit.
"1": Requests that the device server not read into the buffer any logical blocks
beyond the addressed logical blocks.
"0": The device server continues to read logical blocks into the buffer beyond
the addressed logical blocks.
n. FSW (force sequential write)
This bit specifies how to write multiple blocks.
"1": If the HDD writes multiple blocks, this indicates that data are recorded on
the disk media in the order in which they are transferred from the INIT.
"0": If the HDD writes multiple blocks, this indicates that data are recorded on
the disk media with their order changed in order to complete the
command in the fastest time.
This bit cannot be changed. The HDD disregards the specification in this bit
and operates according to the "Default" value (="1").
o. LBCSS (logical block cache segment size) (not supported)
"1": Indicates that the "Cache segment size" field units are interpreted as
logical blocks.
"0": The "Cache segment size" field units are interpreted as bytes.
This bit is not supported for the HDD. The HDD disregards the specification
in this bit.
p. Number of cache segments/Cache segment size
This parameter specifies the number of cache segments used by the HDD.
This parameter is valid when the SIZE bit specification is "0."
When a value greater than max value is specified, the HDD performs
rounding processing and sets max value. Also, when a value less than 3 is
specified, the HDD performs rounding processing and set 4.
302 C141-C013