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5-108 Quantum DLT 7000 Tape System
MODE SENSE (6) / (10) Command (1Ah / 5Ah) (continued)
Table 5–51 MODE SENSE Block Descriptor - Field Descriptions (continued)
Field Name Description
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).
5.10.3 MODE SENSE Mode Pages
The following figure depicts the variable length page descriptor.
Bit
Byte
7 6 5 4 3 2 1 0
0 PS 0 Page Code
1 Additional Page Length
2 Page Defined or Vendor-Unique Parameter Bytes
Figure 5–52 MODE SENSE Page Descriptor - Data Format
Descriptions of the MODE SENSE page descriptor fields are provided in the
following table. Detailed descriptions of each of the MODE SENSE Pages follow.