To be more precise, a CD-Audio disc does NOT contain
actual files at all (CD-Audio discs don't have
a computer file system). Those "CDA" files you see
in Windows are just a virtual representation of the
audio tracks contained in the disc. In old versions
of Windows (prior to Windows 95) and also in
real mode MS-DOS (version 6 and earlier)
CD-Audio discs just produced a read error message
when trying to read their contents, because those
discs don't really have a filesystem. In Windows 95
they introduced these "virtual" CDA files as a way
to present the tracks to the user in a "smart" way
instead of just displaying an error message.
But those CDA files really don't exist in the CD!.
So when you burn WAV files to a CD-Audio you don't
have files anymore but just plain PCM audio streams
burned sequentially into the disc, which follow
the track structure specified in the TOC
(maybe you could call this a "file system", but
it's not really a file system in the strict sense).
Finally, some advice: only use CD-Audio for
final product (or just personal use in
CD-Audio player equipment).
But don't make backups in CD-Audio discs,
because CD-Audio discs are more prone to errors,
since their error-correction system is
weaker to that of Data CDs, and when ripping
CD-Audio back to the computer you might
lose some quality in the process, whereas
Data CD backups will always be bit-perfect copies,
so it's better to make audio backups in Data CDs (just
burning the WAVs as Data "CD-ROM" instead of CD-Audio).
When burning WAVs as data you'll have slightly
less space. An 80 minute CD-R holds 700 MB of data
or 800 MB of audio (approximately). This is
because data CDs have extra error-correction
information, thus the space "waste", but it's
safer to store information as data than as audio,
especially if you expect the contents to
have the same quality in years to come.
Ripping old ageing CD-Audio recordable discs
may result in having clicks and pops all over it
(it also depends on media quality, among other factors)
when trying to rip them to the computer, but Data CDs
always sound with the same quality as new).
Of course Data CDs can fail, but the difference with
Audio-CD discs is that Data CDs can only be
perfectly read or not read at all, but if a Data CD
is completely unreadable, then that means
that if the disc had CD-Audio content,
it would have been completely unreadable too...
OMA
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