using mt without raw devices (nrast0)

Hi all,

I have to struggle with a OnStream DI-30 on 5.2 (RC2).
The drive gets recognized as ast0 and with 32k blocks taring to /dev/ast0 
seems to work fine.
But how can I control the tape? "mt" gives for almost any command:
	mt: /dev/nast0: eod: Input/output error
The rewind command gives no error but finishes way too quick.
Also I haven't been able to restore any data yet.

I'm aware about the DI-30 but that's the one I have to deal with atm.

What's the trick with the missing raw devices on 5.2?

Thank you,

-Harry