In article , Steve Swift
wrote:
There is no copy protection possible with audio CDs. They are nothing
but a string of digitized values and a simple index.

Some audio CD's are created with an eccentric spiral track pattern.
Domestic CD players are supposed to tolerate this; some don't. PC CD
drives are supposed to fail on these; most don't. It's a primitive copy
protection mechanism, defeated mostly by the economics.

It's also the difference between cheap writeable blank CD's and their
more expensive "Audio" versions - the audio versions have the eccentric
pattern, so are less likely to work in other PC's.

I'd be interested in knowing the source of the above as it is news to me!

My understanding is that 'Audio' and 'Data' CDR blanks differ wrt to the
information pre-written onto the blank. This is read by a consumer CDR
audio recorder and tells it not to record onto a 'Data' blank.

I've seen various 'copy protection' schemes for commercial 'audio' sic
discs, but not the one you describe, so I'd be interested to know where
the info is from.

Slainte,

Jim

--
Electronics http://www.st-and.ac.uk/~www_pa/Scot...o/electron.htm
Audio Misc http://www.st-and.demon.co.uk/AudioMisc/index.html
Armstrong Audio http://www.st-and.demon.co.uk/Audio/armstrong.html
Barbirolli Soc. http://www.st-and.demon.co.uk/JBSoc/JBSoc.html