SCSI Commands

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

Table 5–49 MODE SENSE Control Descriptor Block - Field Descriptions

Field Name

Description

 

 

DBD

Disable Block Descriptors. If 0, device returns the block descriptor

 

data. If set to 1, block descriptor information is not returned.

PC

Page Control. The Page Control field indicates the type of page

 

parameter values to be returned to the host.

 

PC

Description

 

00

Report Current Values

 

01

Report Changeable Values

 

10

Report Default Values

 

11

Report Saved Values

Page Code

This field allows the host to select any specific page or all of the

 

pages supported by the drive.

Allocation Length

This field specifies the number of bytes that the host has allocated for

 

returned MODE SENSE data. An allocation length of zero indicates

 

that the drive will return no MODE SENSE data. This is not considered

 

an error, and GOOD status is returned.

 

 

 

MODE SENSE may be either MODE SENSE (6) or MODE SENSE (10). MODE SENSE (6) data contains a 4-byte header followed by one 8-byte block descriptor, followed by zero or more variable length pages, depending on the Page Code and Allocation Length.

Quantum DLT 7000 Tape System

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Quantum Instruments DLT 7000 manual Mode Sense Control Descriptor Block Field Descriptions, Dbd
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DLT 7000 specifications

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