In rec.audio.tech Jeff Findley wrote:

A guy I work with used to work at a CD plant and from what he understands
from working there, the type of media used to deliver the master to the CD
plant could make some difference. If the media was digital, then the CD's
pressed would be exact digital copies, but if the media was analog, that
meant that what the plant got was going to be an "AAD" CD with the
additional possibility that the CD plant's analog to digital conversion
might not be as good as what could be done by a recording/mixing studio.

SPARS Code
http://en.wikipedia.org/wiki/SPARS_Code


When was the last time anyone delivered analog media to a CD pressing
plant? Was this something done in the early 80s?

I always took 'AAD' to mean that the CD was mastered digitally --
redundant, really, since by definition all CDs involve digital
mastering.


___
-S
"As human beings, we understand the world through simile, analogy,
metaphor, narrative and, sometimes, claymation." - B. Mason