A commonly posed question from the newsgroups: “what software can do bit-for-bit copies?” The expectation is software that can make an exact copy of the original.
There isn’t any. If this seems counter-intuitive, bear in mind that discs hold digital data on an analog medium. While “bits” may be what you read from the drive, at some point those bits have to be stored as marks or indentations on a piece of polycarbonate. The “low-level” modes, such as “raw DAO-96”, are actually pretty high level. By the time you’ve got 2352-byte sectors and 96-bits of subcode channel data, the drive has converted optical reflections to an analog signal, converted the analog signal to digital bits, combined individual bits into 24-byte frames, applied error correction, and assembled the frames into the data you see. When you’re writing a sector, all that stuff happens on the way out, too, and there’s no way for CD recording software to control it. What’s more, there are copy protection features, such as *physically* damaged blocks, that a recorder isn’t generally capable of writing.
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