Hello,

> in, sd0 and sd1 disappeared. Tech support is claiming this is normal,
> and that the tape has to be the only scsi device on the bus. I am
> incredulous. What do you think?
Half truth, I have a DSS1 streamer, a CDROM and 2 disks on the same 
bus. But it's only fast/wide, see below...
But your streamer probably only supports 8bit/10MHz/SE, while U320 is 
160MHz/16bit/LVD - you can't mix SE and LVD devices on the same bus ( 
well, technically you can but that would force all devices to SE 
operation which means max. 40MB/s ). If your card doesn't have a good 
old 50pin connector I'd look for some cheap SymBios 53c810 or a Tekram 
dc315 card on ebay for the slow device(s).

> Is bad tape drive (communications) a possibility? or more to do with
> the medium?
What kind of cable do you use? The SCSI controller is probably confused 
about finding a SE device on an LVD cable.

have fun
Michael