The st_clean device-clean script supports three tape devices:
SCSI ¼-inch tape
Archive ¼-inch tape
Open-reel ½-inch tape
The st_clean script uses the rewoffl option to the mt command to clean up the device. For more information, see the mt(1) man page. If the script runs during system boot, the script queries the device to determine if the device is online. If the device is online, the script determines if the device has media in it. The ¼-inch tape devices that have media in them are placed in the allocate error state. The allocate error state forces the administrator to manually clean up the device.
During normal system operation, when the deallocate command is executed in interactive mode, the user is prompted to remove the media. Deallocation is delayed until the media is removed from the device.