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I've never burned a CD before and am thinking of copying some of my collection and selling the originals on Ebay. I've amassed quite a few MFSL gold CD's over the years and am shocked at what they sell for on Ebay.
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More than $150,000 a pop? Copying CDs you own for your own use is legal. Selling your CDs without keeping copies of them is legal. But what you propose sounds questionable at best.
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anyway, anyone know the answer to his original question? i'm still curious.
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Whether it's an exact bit-for-bit copy of what the computer can read from the CD-ROM drive would depend on the software. E.g., track-by-track burning or deletion of subcode data might cause some bits to be different even if the stereo audio bits for each track were an exact copy of what the computer read.
There's a separate issue in that the computer might not be able to read an exact copy of the bits on the CD. The CD-Audio format is not known for near-100% odds of perfect recovery of bits; the idea is to feed a constant-rate stream of bits to the player, and if a bit is corrupted, why the player can just interpolate a fix, or play the bad bit as-is. CD-ROM format devotes some of the disk space to more error detection/correction overhead precisely because such errors are not tolerable when reading things like .EXE files.
On the writing side, the CD burner may introduce additional errors. Some people have run into problems where audio CDs burned at high speed have "clicks" when played back on home stereos. The problems often go away when burning at low speed, suggesting a mechanical cause (such as vibration of the disc or the write laser).
So it's sort-of bit-for-bit, but there are opportunities for things to go wrong -- sometimes with audible results, sometimes not.