SCSI Commands

MODE SENSE (6) / (10) Command (1Ah / 5Ah) (continued)

Table 5–51 MODE SENSE Block Descriptor - Field Descriptions (continued)

Field Name

Description

 

 

Number of

This field is sent as 0, indicating that all of the remaining logical blocks on the tape

Blocks

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

7

6

5

4

3

 

2

1

0

Byte

 

 

 

 

 

 

 

 

 

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.

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Quantum DLT 7000 Tape System

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Quantum Instruments DLT 7000 manual Mode Sense Mode Pages, Mode Sense Page Descriptor Data Format

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