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l.
Maximum pre-fetch control block count (not supported)
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 IDD the maximum pre-fetch quantity cannot be limited.
This parameter cannot be changed. The IDD disregards the specification in
this field.
m. DRA (disable read-ahead) (not support)
This bit specifies whether or not activate the read-ahead operation.
This bit cannot be changed. The IDD disregards the specification in this bit.
"1": Requests that the device server not read into the buffer any logical blocks
"0": The device server continues to read logical blocks into the buffer beyond
n.
FSW (force sequential write) (not supported)
This bit specifies how to write multiple blocks.
"1": If the IDD writes multiple blocks, this indicates that data are recorded on
"0": If the IDD writes multiple blocks, this indicates that data are recorded on
This bit cannot be changed. The IDD 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
"0": The "Cache segment size" field units are interpreted as bytes.
This bit is not supported for the IDD. The IDD disregards the specification in
this bit.
p.
Cache segment count
This parameter specifies the number of cache segments used by the IDD.
This parameter is valid when the SIZE bit specification is "0."
When a value greater than max value is specified, the IDD performs rounding
processing and sets max value. Also, when a value less than 3 is specified,
the IDD performs rounding processing and set 4.
C141-C009
beyond the addressed logical blocks.
the addressed logical blocks.
the disk media in the order in which they are transferred from the INIT.
the disk media with their order changed in order to complete the
command in the fastest time.
logical blocks.
4.1 Control/Sense Commands
4-49
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