i’m mostly interested in scanning dual layer dvds,
can you suggest which models specifically?[/QUOTE]
As vroom said LiteOn is ok for that also has sometimes problems with second layer, when jitter test is enabled. Other actual drives even doesn’t be able to scan jitter at all so it is no disadvantage for me. If you want jittertest also with DL you can look after an old BenQ 1640, 1655. They do jittertest on DL burns without any problem and are perfect CD scanners also, which the LiteOns are not.