perhaps because when there is no disk in it, it can't get the drive 
geometry? this theory would also likely be borne out if you were to bring it
up with a cd in, but subsequently change it for another, if it would still
work, or if it would assume the original cd's vitalstatistics even with the
new cd in.. 

isildur

On Sat, 31 May 2003, J. Buck Caldwell wrote:

> Hmm.. well, I'm getting farther. If I boot it with a CD in the drive, it 
> seems to work, and shows it as a RRD40. Any reason why it won't show up 
> properly without a CD in the drive?
> 
> > J. Buck Caldwell wrote:
> >
> >> I've got a VAX4000/200 with a CMD CQD223 in it. Works great for 
> >> disks. However, when I hook up a CD-ROM, it recoginizes it as a tape, 
> >> and shows MUA0, and device mt0 as a TU81. Will I be able to read CDs 
> >> off this thing, or is there some bit of config in the controller I 
> >> need to change? What can I do to get it recognized as cd0, or will it 
> >> work fine as mt0?
> >>
> >> Perhaps I should test. Hang on...
> >>
> >> Nope, just get mt0: Input/Output error. Any ideas?
> >>
> >
> >
> >
> 
> 
>