Sorry , I’ve read again and seems I mix comments with other forum/thread and made mistakes . Permit me to re-route. Obviously we have neglected some facts. I’ll try to clarify point by point:
(a) Effectively, we do not have the scans; so ‘few’ data to evaluate. Except the [very low] 3.5 PI versus the [low] 20 PI. Are we speaking about 2 sample discs ? or 20 ? It’s not important to answer, given the point (b).
(b) As rdgrimes stated someway in other thread, such PI values levels are so low, that a factor of 10x is expected as ‘normal’ (20/3.5 =aprox 6x ) I agree (in THOSE levels).
© (CORRECTION of myself) At this very moment, regarding such a low PI values you get with both PC’s, I would not doubt both PC’s / PSU’s have good hardware. My explanations about the 12v variations can affect the burn, but it seems it’s NOT your case. Enjoy your burner an PC’s
(d) rdgrimes request of ‘sampling rate’ is significant, of course. And the whole scans, of course.
(e) rdgrimes [“Pi/PO scanning. It has nothing to do with data errors”]. Subtle statement, but written in such a way may lead to misinterpretation, for the normal public.
PI/PO has to do with BIT(s) read errors. But the errors are automatically corrected [thanks to some kind of standardized/engineered ‘redundancy’ bits], so your final data [files you read] is completely there: no bit is lost, except if there are POF [right?]. I’m not an expert and I don’t want to be (so I don’t mind corrections, if any), but I understat “PI” as[blocks of] bits reading errors found from the disc but corrected by the “first level” of correction algorithms; some CPU/internal chip processing is required for that correction. Then come PIF errors [rather than PO], when the “first level” did not have success; but the “second level” of correction algorithms play its wonderful role and… recover your real data. So you have PI, then PIF, but your valuable data files are completely there, without an errored bit. The level of corrections are like barriers protecting you; but the second barrier can be broken sometimes [POF], and this is really a DATA error [you rally have lost a file or part of a file].