Wangtek 1/4 inch tape drives on Sun 3/50?

[9531cald%ucsbuxa at hub.ucsb.edu]

I have a Wangtek 1/4 inch tape drive that operated fine on a Sun 3/50
running the version 3.5 OS. After upgrading to 4.0.1 it no longer seems to
read or write. I can rewind, retension, and even do a status using the
"mt" command. But when I try "mt -f /dev/nrst8 fsf 3" or any other command
that involves a read or write I get an I/O error. Tar and dump with
various parameters stopped working altogether. The error is "media error"
(sense key 3).

Is their anyway to install the 3.5 driver for the st tape drive? Does
anybody know of any solutions to this problem?

Thanks,

Tom Caldwell
Computer Center
University of California, Santa Barbara
Bitnet: 9531cald at ucsbuxa.bitnet
Internet: 9531cald at ucsbuxa.ucsb.edu