Samsung DVD writers families

These are the interesting drive families:
S*-W16x series: 16x, Mediatek chipset, no DVD-RAM support

• SH-W162: Internal P-ATA
• SH-W163: Internal S-ATA
• SE-W164: External USB

S*-S16x series: 16x, several chipsets, with DVD-RAM support

• SH-S162: Internal P-ATA
  There is no S-ATA or external version.

S*-S18x series: 18x, Mediatek chipset, with DVD-RAM support

• SH-S182F: Internal P-ATA (OEM: TS-H652F)
• SH-S182D/M: Internal P-ATA (OEM: TS-H652D/M);
  D=no Lightscribe, M=with Lightscribe
• SH-S183A/L: Internal S-ATA (OEM: TS-H653A/L)
  A=no Lightscribe, L=with Lightscribe
• SE-S184M: External USB (in fact a SH-S182M in external enclosure)
  Also, some Philips and Sony drives are based on SH-S18* family

S*-S20x series: 20x, Mediatek chipset, with DVD-RAM support
See also attached specs document below

• SH-S202H/J/G/N: Internal P-ATA (OEM: TS-H652H/J/G/N)
  N=with Lightscribe
• SH-S203B/N/D/P/S: Internal S-ATA (OEM: TS-H653B/N/D/P)
  N and P=with Lightscribe
• SE-S204N/S: External USB
  with Lightscribe, S with "TruDirect" support additionally

S*-S22x series: 22x, Mediatek chipset, with DVD-RAM support

• SH-S222A/L: Internal P-ATA
  L=with Lightscribe
• SH-S223F/Q: Internal S-ATA
  Q=with Lightscribe
• SE-S224Q: external USB, with Lightscribe

(Source: http://www.samsungodd.com/eng/Products/Spec/Spec.asp)