[nmglug] seagate stt3401a tape errors

[js at jasonschaefer.com]

mt -f /dev/st0 status

returns:

st0: Error with sense data: Current st09:00: sns = 70 5
ASC=20 ASCQ= 0
Raw sense data:0x70 0x00 0x05.......
SCSI 2 tape drive:
File number....

Anyone know what might cause this?