[jpstewart]

I use an HP SCSI DVD-ROM, which is just a re-badged Pioneer DVD-305S.  Works fine with my Octane and anything else I've connected it to. 

It's a 50-pin device, so I use a Sun 611 SCSI enclosure.  That has an external 68-pin interface that matches the Octane's external port, but has a 50-pin internal connector for the drive.  The 611 auto-terminates either the whole SCSI bus (if it's the last device) or just the high bytes (if there's another 50-pin device downstream on the SCSI chain).  It's a really handy enclosure to have.  (Those comments apply to the open-front 611 enclosure.)