BenQ DW16** drives will report C2 errors when scanning CDs in CDSpeed!
They just don't report C2 errors when reading a disc, unlike some other drives.
I think that Plextor drives (PX-712/716/755/760) are the best overall scanning drives, because they can scan both CDs and DVDs reliably, and they can scan for more things than any other drive including the BenQ. But they are also incredibly slow DVD scanners, so they are not my first choice for everyday DVD scanning.
Many people think that BenQ drives are not the most reliable scanners when scanning DVDs burned in some other non-BenQ drives such as LG, LiteOn, NEC and recent Plextors.
So my overall favourite DVD scanner would be a LiteOn DVD burner, even though they don't report jitter, because they don't seem to favor discs burned in one type of drive over another.
BenQ DVD burners are very good CD scanners and so are Plextor DVD burners (PX-712/716/755/760) and Plextor Premium CD-RW burners.
But a LiteOn would be my first choice as a DVD scanner.
You shouldn't rely on a LiteOn DVD burner for scanning CD media however, because LiteOn DVD burners report unrealistically low C1 and C2 compared to other more reliable CD scanners.
There's a chance that jitter scanning will be made possible on existing LiteOn 5S/6S drives, because insiders at LiteOn have talked about the possibility of implementing this over in the LiteOn forum.
No promises have been made however!
Agreed. But Plextors can perform scans that no other drive can offer, such as Parity Outer Errors (Burst scan), Bytes corrected per ECC block (Basic scan), and Beta a.k.a Asymmetry (Jitter/Beta scan).