This article is from the storage FAQ part2, by Rodney D. Van Meter with numerous contributions by others.
http://www.cyberdatasys.com has frustratingly little info on a product that apparently is 7 CD-ROM drives made to behave like a single SCSI target. Not really an autochanger, more of an array. Not sure who the manufacturer is; the same unit is available from Procom http://www.procom.com. (rdv,96/8/5)