Sony DDU-1621 (BTC OEM) is among the quietest DVD-ROMs I've ever used and I've tried the most silent from LG and Samsung too.
Hoewever, it does not have any kind of error correction for DVD discs! AT least this is according to all the tests I've read about it.
We've also tried this disc on various pressing faulty dvd video discs and it always locks up and has to be powered down to be re-enabled.
Otherwise it's a very silent and useful drive with very good error concealment for ripping scratched audio discs.