I just got around to testing this really old caddy based SCSI CD-ROM drive that came with the big pallet of Mac stuff.

Apparently it's made by Chinon, and it's only 1x. Yes - 1x. The slowest drive I owned until now is 2x. I had to buy a caddy off of eBay for it. It seems to work fine using the CD Sunrise driver. Very interesting old piece of technology here. I'll probably hook it up to one of the older CD-less Macs just because I can.