Quantum DLT 2500, Product Manual

Page: 152 / 345

DLT2000 SCSI Interface
8-6 DLT2000/DLT2700 Cartridge Tape Subsystem
___________________Note _____________________________
In contrast to the BUSY status condition, the DRIVE NOT
READY Sense Key is returned as part of the Sense data following
a REQUEST SENSE command and indicates that a media access
command has been issued and the media is not ready to be
accessed (for example, the media is not installed, the media has
been unloaded, the drive is currently initializing the media to
prepare it for access, and so forth.)
_____________________________________________________
In the not ready state, the initiator cannot perform any operation which would cause
tape motion (for example, write, read, verify, space, and so forth). These commands
will return a CHECK CONDITION status with a DRIVE NOT READY sense key. The
initiator may, however, execute commands that do not require access to the media and a
GOOD status may be returned. These commands are as follows:
These commands are as follows:
•
INQUIRY
•
LOAD UNLOAD
•
LOG SENSE/SELECT
•
MODE SELECT
•
MODE SENSE
•
PREVENT/ALLOW MEDIUM REMOVAL
•
READ BLOCK LIMITS
•
READ BUFFER
•
READ ELEMENT STATUS
•
RECEIVE DIAGNOSTIC RESULTS
•
REQUEST SENSE
•
RESERVE/RELEASE UNIT
•
SEND DIAGNOSTIC (non-media access diagnostics)
•
WRITE BUFFER
The TEST UNIT READY command is used to determine whether the tape drive would
accept a media access command without returning CHECK CONDITION status.