You're correct in that a compressed file cannot be "returned" to lossless, the bits have been thrown away forever.
I don't understand that last question: "and find out what the original type and quality or speed of the disc was made at".
If your disc in question was an mp3 file burned as CDA, it could be compressed to mp3 again which would be a very bad thing and sound awful. This would be obvious.
Last edited by GreatDane; 08-29-2008 at 12:51 AM.
Reason: rewording
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