On Sun, 23 May 1999, Christoph Badura wrote:

> prlw1@newn.cam.ac.uk (Patrick Welche) writes:
> >st0(ahc0:4:0):  Check Condition on CDB: 0x00 00 00 00 00 00
> >    SENSE KEY:  Media Error
> >     ASC/ASCQ:  Incompatible Medium Installed
> 
> >This happens no matter what I try eg mt status, tar t,
> >dd if=/dev/null of=/dev/nrst0, mt erase etc. Any thoughts on what
> >else I could try? (NetBSD-1.4/i386)
> 
> Those are media errors.  Make sure that the tapes are OK and that
> the heads aren't dirty/worn down.

A T5000 takes only 60m and 90m DDS-1, so a T4000 takes, what, 60m's?
Are you trying to use something else?