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SCSI Commands

5-92 Quantum DLT 4000 Tape Drive

5.10 MODE 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 as

follows. An illustration of the command descriptor block for the 10-byte MODE

SENSE (5Ah) follows on the next page.

Bit

Byte

7 6 5 4 3 2 1 0

0 Operation Code (1Ah)

1 Logical Unit Number Rsvd DBD Reserved

2 PC Page Code

3 Reserved

4 Allocation Length

5 Unused Reserved Flag Link

Figure 5–43 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).

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Quantum DLT 4000 Manual Pagina 192