Test Unit Ready; Command Description; Command Descriptor Block; Exception Handling - Tandberg Data SLR7-140 PROGRAMMER Manual

28.
BYTE BIT 7
Operation Code 00h
00
01 Logical Unit Number (LUN)
02 RESERVED
03 RESERVED
04 RESERVED
05 Control Byte
Table 28-1:
Sense Key AS/AQ
ILLEGAL REQUEST
25h/00h
NOT READY 04h/01h
NOT READY 04h/02h
NOT READY 30h/03h
NOT READY 3Ah/00h

Test Unit Ready

28.1. Command Description

The TEST UNIT READY command provides a means to check if
the Drive is ready for a medium access command. If the
Drive would accept an appropriate medium access command
without returning CHECK CONDITION status, this command
will return GOOD status. See the section on Command Set
Summary for the list of Medium Access Commands.
The Drive will
command.

28.2. Command Descriptor Block

6 5
TEST UNIT READY Command Descriptor Block

28.3. Exception Handling

See section Error Conditions For All Commands.
In addition the TEST UNIT READY command will respond
with CHECK CONDITION status in the following situations:
Description
LOGICAL UNIT NOT
SUPPORTED
LOGICAL UNIT IS IN THE
PROCESS OF BECOMING
READY
LOGICAL UNIT NOT READY,
INITIALIZING COMMAND
REQUIRED
CLEANING CARTRIDGE
INSTALLED
MEDIUM NOT PRESENT

Table 28-2: TEST UNIT READY Response

28-1 Tandberg SLR Product Line SCSI Functional Specifications
not disconnect
4 3
RESERVED
Comments
The LUN field of the IDENTIFY message or
in the CDB is not zero.
The Drive is performing an auto-load or a
load operation. This response is produced
only when the BSYA bit of the Miscellaneous
Parameters Page is set to 1.
The medium is inserted, but not loaded. The
Initiator should issue a LOAD command.
The Drive can not perform media accesses
on a cleaning cartridge.
There is no medium or the medium has been
ejected.
when executing
2 1
this
0