Others have already pointed out that MP3 files are like any other kind of computer file; as long as no errors occur during copying, the copies will be exactly identical to the original. Only if you decompress and recompress will there be any further degradation.

Having said that, let me make a plug for FLAC (Free Lossless Audio Compression). Not only does FLAC not lose *any* quality from the original PCM WAV format (the format on standard audio CDs) but the FLAC header also includes a built-in MD5 hash of the uncompressed audio. This lets you verify a FLAC file to ensure that it's not corrupted. (You use the command "flac --test file.flac"). I don't know of any other commonly used audio format with this *very* nice feature.

FLAC uses much more space than the lossy formats like MP3, Ogg Vorbis and AAC, but modern disks are *so* roomy and cheap that this just isn't a big deal anymore for a desktop machine.

I chose FLAC as my primary format on my Slimserver, and I can still produce lossy compressed versions from the FLAC masters as needed for various portable players.

Phil
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