SCSI Commands

5.10MODE SENSE (6) / (10) COMMAND (1Ah / 5Ah)

The MODE SENSE command allows the drive to report its media type, and current, or changeable configuration parameters to the host. It is a complementary command to MODE SELECT.

The command descriptor block for the 6-byte MODE SENSE (1Ah) is shown below. An illustration of the command descriptor block for the 10-byte MODE SENSE (5Ah) follows on the next page.

Bit

7

 

6

 

5

4

 

3

 

2

1

0

Byte

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

Operation Code (1Ah)

 

 

 

 

 

 

 

 

 

 

 

 

1

 

Logical Unit Number

 

Rsv’d

 

DBD

 

 

Reserved

 

 

 

 

 

 

 

 

 

 

 

 

2

 

PC

 

 

 

 

Page Code

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

 

 

 

 

 

Reserved

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4

 

 

 

 

 

Allocation Length

 

 

 

 

 

 

 

 

 

 

 

5

 

Unused

 

 

Reserved

 

Flag

Link

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure 5–47 MODE SENSE (6) Command Descriptor Block - Data Format

The 10-byte MODE SENSE command is required to request the Vendor-Unique EEPROM parameter page due to the large amount of data that parameter page contains. MODE SENSE (10) can be used to retrieve the other pages as well.

Note that MODE SENSE (10) returns descriptor data in a different format than MODE SENSE (6).

Quantum DLT 7000 Tape System

5-101

Page 205
Image 205
Quantum Instruments DLT 7000 manual Mode Sense 6 / 10 Command 1Ah / 5Ah, Mode Sense 6 Command Descriptor Block Data Format

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