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Pio asked :
So why do we blind ourselves thinking there should be only one valid offset, while
the evidence that 80 % or the official CDs use a different offset is before our eyes??
Because we are talking about drives, and drives have a fixed offset. We do not talk about CDs that are mastered in a different factory or have some information in the pregap.
Of course to be able to exactly replict a CD you need variing offsets on reading, but then you need of course also variing offsets on writing. This will complicate everything even more.
I think we could agree that a drive has a fixed read offset and fixed write offset and that
read offset + write offset is constant for two drives. Only the absolute value could change.
Now having found my offset is no proof that it is correct, but the resulting write offsets make me think that it is correct.
A small block of audio is of 6 sample length and so the smallest unit. If you have a look at the write offsets (depending on EACs read offsets of course), most of them are divideable by 6 and most are around 0 (from -30 to 30 usually)...
I can't tell if my offset setting is correct or yours, or even a different one. We would need to have very expensive devices to measure the write offset (which is the only thing possible), but I don't think that this is really such important. Most times I do my copies without offset correction, but I usually only do one generation...
cu, Andre
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