C141-E054-02EN
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g. Pre-fetch inhibit block count (not supported)
This parameter is used to selectively prohibit data Look-Ahead operations in the READ
command or the READ EXTENDED command. When the "Transfer block count"
specified in the CDB of the READ command or the READ EXTENDED command is
greater than the value in this parameter, data Look-Ahead operations are not executed in
that command. This bit cannot be changed. The IDD disregards the specification in this bit
and operates according to the "Default" value (= X 'FFFF').
h. Minimum pre-fetch (not supported)
This parameter specifies the minimum quantity of logical data blocks pre-fetched to the
data buffer with the READ command or READ EXTENDED command.
This parameter cannot be changed. The IDD disregards the specification in this field.
i.
Maximum pre-fetch (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.
The IDD varies the pre-fetch volume according to the volume of data requested by the
READ command or READ EXTENDED command. The value reported to the MODE
SENSE command always indicates the number of blocks corresponding to 1 cache
segment – 1.
This parameter cannot be changed. The IDD disregards the specification in this field.
j.
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.
k. FSW (force sequential write) (not supported)
"1" : If the IDD 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 IDD 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 IDD disregards the specification in this bit and operates
according to the "Default" value (="1").
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