On 18/02/2017 12:00, Iain Churches wrote:
Did the multiple errors affect the replay, or prevent
the disc from playing? Quite often they do not.

I only put it in the tester because I had so much trouble playing it.

CD plants produce in "lines", so the replacement disc does
not have to be made somewhere else just on a different line.

The format of the ID number in the centre was different. I suspect a
different plant.

A Reed Solomon reader (probably like the one you had at
work) is used for QC. One of these two gentlemen
(Reed or Solomon) is quoted as saying "without error
correcting codes digital audio would not be technically
feasible"

It would give back analogue level data - pit/land lengths and
reflectivity, that sort of stuff - as well as the number of corrected
and uncorrectable errors. It was also stupidly expensive. My memory has
failed me though, and I can't recall the name!

Andy