(After you take the cover off? :))
I don't know, actually. Mine are decent enough to be labelled on the outside, properly.
Does "mt" give it to you?
(my tape drives are listed in /dev/rmt)
mt -f /dev/rmt/1un status
Quantum DLT7000 tape drive:
sense key(0x0)= No Additional Sense residual= 0 retries= 0
file no= 52 block no= 0