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Number of Blocks This field is sent as 0, indicating that all of the remaining logical
blocks on the tape have the medium characteristics specified by the
block descriptor.
Block Length This field specifies the length (in bytes) of each logical block
transferred over the SCSI bus. A block length of 0 indicates that the
length is variable (as specified in the I/O command). Any other value
indicates the number of bytes per block that are used for READ,
WRITE, and VERIFY type commands that specify a fixed bit of 1
(fixed block mode).
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