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The READ BLOCK LIMITS data shown below is sent during the DATA IN phase
of the command. The command does not reflect the currently selected block size,
only the available limits. MODE SENSE is the command that returns the current
block size.
Bit
Byte
76543210
0 Reserved *
1 - 3
(MSB)
Maximum Block Length
(LSB)
4 - 5
(MSB)
Minimum Block Length (0001h)
(LSB)
* In SCSI-3 configurations, Byte 0 appears as shown below:
0 Reserved Granularity
The *UDQXODULW\ field is described in the table below.
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Granularity 6&6,
2QO\
This field indicates the supported block size granularity. The
DLT8000 tape drive supports all block sizes Q such that Q minus the
minimum block length limit is a multiple of 2
x
(where
x
is the value in
the Granularity bits), and Q is greater than or equal to the Minimum
Block Length Limit and less than or equal to the Maximum Block
Size Limit. For the DLT8000 system, the content of the Granularity
field is 1 (since block sizes must be a multiple of 2; 2
1
= 2).
For backward compatibility, the DLT8000 will process requests that
do not meet Granularity criteria, except for Odd-byte Multiple Block
Fixed Block WRITE commands when connected to a Wide (16-bit)
SCSI bus.
Maximum Block
Length
The value in this field indicates the maximum block size. The tape
drive supports a maximum block length of 16,777,214 (16 MB-2) for
10, 15,20, 35, or 40 GB format.
Minimum Block
Length
The value in this field indicates the minimum block size. The tape
drive supports a minimum block length of 2 bytes.
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