Dell PowerVault TL4000 - Manual (Page 105)

Chapter 5. Command Status Byte
The media changer enters the status phase once per command and returns the following status bytes.
Status Value Description
Good 00h This status indicates, that the media changer successfully completed
the command
Check condition 02h An error condition occurred during command processing. The
REQUEST SENSE command responds with detailed error
information
Busy 08h The target is busy. This status is returned when the device is unable
to accept a command from an otherwise acceptable initiator. The
initiator should reissue the command at later time.
Reservation conflict 18h This status is returned by the media changer when a SCSI initiator
attempts to access the media changer after it is reserved by another
initiator with the RESERVE command
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