This article is from the CD-Recordable FAQ, by Andy McFadden (firstname.lastname@example.org) with numerous contributions by others.
PlayWrite 2000 (2x2/1MB;SCSI, based on the Sony CDU920S)
PlayWrite 2040 (4x2/512K+;SCSI)
PlayWrite 4000 (4x4/512K;SCSI, based on the Yamaha CDR-100)
PlayWrite 4001RW (6x4x2/2MB;IDE, based on the Yamaha CDR4001t)
PlayWrite 2060R (6x2x2/1MB;SCSI, based on the Ricoh 6200S)