TheOctavist;685396 Wrote: 
> 
> 
> P.S. - I have no idea why discs are marked as suitable for different
> speeds, apart from commerically generated market differentials. It's a
> physical process and I can see no reason why a disc should not be
> written and read at whatever speed the laser is capable of.. It may
> simply be that after manufacture the slightly eccentric ones are sold
> as slower - to prevent shaking of your drive in operation!!

Writing a CD is a mechanical process that should not be inferred to be
perfect. Unless a target CD is verified to be bit-perfect to the
original, there's plenty of room for variation. The only expected
result is that the copy's data blocks can be corrected by it's parity
data before being passed to the DAC. A good portion of the storage on
an audio CD is devoted to error correction data. This was particularly
pertinent on early players that did not beam-split multi-sample when
reading. Incorrect decoding could fry your stuff.

The original CD can also be expected to require this kind of correction
and contracts to manufacturers usually stipulate how accurate the
pressing must be.

So it can be safely said that recording (writing) speed can have a real
effect on the resulting disk. 

P


-- 
pski

real stereo doesn't just wake the neighbors, it -enrages- them.. It is
truly the Golden Age of Wireless
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