Quantum DLT 4000 Manual descargar pdf (Pagina 254)

SCSI Commands

5-154 Quantum DLT 4000 Tape Drive

5.23 TEST UNIT READY COMMAND (00H)

The TEST UNIT READY command checks the tape drive to ensure that the unit

is ready for commands involving tape movement. If the drive has a tape loaded,

the command returns a GOOD status. Otherwise, CHECK CONDITION is

reported.

Due to power cycle, code update, and tape loaded conditions, it is possible to get

multiple check conditions on a TEST UNIT READY command.

Bit

Byte

7 6 5 4 3 2 1 0

0 Operation Code (00h)

1 Logical Unit Number Reserved

2 - 4 Reserved

5 Unused Reserved Flag Link

Figure 5–76 TEST UNIT READY Command Descriptor Block - Data Format

Medium Changer Considerations

When directed at the Media Changer (Media Loader) LUN, this command

returns CHECK CONDITION, Sense Key, or NOT READY if the MODE

SELECT key is in the SERVICE mode and there is no 24 V signal (lack of 24 V

signal usually indicates the loader assembly has been moved out of its sleeve far

enough to trip the 24 V interlock). The media changer or loader is referenced as

“4500” or “4700”.

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Quantum DLT 4000 Manual Pagina 254