This article is from the CD-Recordable FAQ, by Andy McFadden (email@example.com) with numerous contributions by others.
PX-R24CS (4x2/512K;SCSI, a cousin of the Ricoh 1420C)
PX-W8432T (32x8x4/2MB;IDE), also SCSI PX-W8432Ti/SW with 4MB
PX-W1210TA (32x12x10/2MB;IDE), also SCSI PX-W1210TS with 4MB
PX-W2410TA (40x24x10/4MB;IDE, also 'U' portable USB)
PX-208U (24x8x8/2MB;USB2.0, reads DVDx8, portable)
PX-320A (40x20x10/2MB;IDE, reads DVDx12)
PX-W4824TA (48x48x24/4MB;IDE, TU model is external USB2.0)
For all units, 'C' indicates caddy, 'T' indicates tray, 'S' is SCSI, 'A'
is ATAPI, 'U' is USB.
All units are flash upgradeable. All units except the PX-R24CS support
Users having trouble with the PX-R412C should try turning synchronous
transfer off for that drive.
There appears to be an issue with the Plextor PX-320A and a SiS IDE chipset.
Using the DMA jumper to change the Plextor drive from UltraDMA to multi-word
DMA fixes the problem.