This article is from the CD-Recordable FAQ, by Andy McFadden (firstname.lastname@example.org) with numerous contributions by others.
See http://www.micronet.com/HTDOCS/products.html#cdr [ site gone? ]
MasterCD Plus 4x4 (4x4/512K;SCSI, based on the Yamaha CDR-100)
MasterCD Plus 4x6 (6x4/2MB;SCSI, based on the Yamaha CDR-400)
MasterCD Plus 4x12 (12x4/1MB;SCSI, based on the Teac CD-R55S)