SCSI Interface Specification
SCSI Communications
AUTOLOADER LTO3 – User Reference Manual Rev. 1.01
TANDBERG DATA
Page 6 4 of 79
Status Bytes
After the autoloader executes a command, it issues a status byte to the initiator to indicate whether the
command completed successfully. The following table describes the four status bytes supported by
the autoloader.
Status Byte
Hex
Value
Description
Good
00h
Indicates that the autoloader successfully completed the operation.
Check
Condition
02h
Indicates that an error, exception, or abnormal condition has caused
sense information to be set. The initiator can issue a REQUEST
SENSE command to access this information.
Busy
08h
Indicates that the autoloader is unable to accept a command from
the initiator.
Reservation
conflict
18h
Indicates that the elements identified in the command are reserved
by another initiator.
Table 8
Status byte descriptions
Sense Keys
When the autoloader returns Check Condition status to the initiator, the initiator can issue a
REQUEST SENSE (03h) command to receive information about the error, exception, or abnormal
condition. This information includes a sense key, which describes the general error or change of state.
The following table describes the sense keys supported by the autoloader.
Sense key
Hex
Value
Description
No Sense
0h
Indicates that there is no specific sense key information to be
reported.
Recovered error
1h
Indicates that the last command completed successfully but
required the autoloader to perform some recovery action.
Not ready
2h
Indicates that the autoloader cannot accept any motion
commands.
Hardware error
4h
Indicates that the autoloader detected a hardware failure.
Illegal request
5h
Indicates that there was an illegal parameter in the command
descriptor block (CDB) or in the additional parameters supplied
as data for some command.
Unit attention
6h
Indicates that the state of the autoloader may have changed.
Aborted command
Bh
Indicates that the autoloader aborted the last command.
Table 9
Supported sense keys