The removal operation deletes the information about the backups stored on the selected tape and about the tape itself from the database.
You can only remove an offline (ejected) tape.
To remove a tape:
What to do if I removed a tape by mistake?
Unlike an erased tape, the data from a removed tape is not physically deleted. Hence, you can make backups stored on such tape available again. To do so:
During the inventorying, do not select the Move newly detected tapes from the 'Unrecognized tapes' or 'Imported tapes' pools to the 'Free tapes' pool check box.