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Actually, Civil Air Patrol and the local search and rescue group
tested this, and they really are not effective for signaling.
If it is all you have, use it.

Much better: USAF 4"x6" or 5"x7" glass signal mirror, with sighting
hole.

Did you compare them to stainless steel mirrors?

I would expect the big problem with CDs is that they don't actually have a
very smooth surface. The light is reflected very unevenly. But I wonder if
one is comaparing them to the commonly found 2"x3" stainless steel mirrors
if the CD's don't come out to perform roughly the same or better (the extra
area compensating for uneven reflections).

Where does one find a 5"x7" glass signal mirror? The only ones I've seen
are the smaller 2"x3" ones. My quick Google search turned up plenty of
side-view mirrors for SUVs, some survival equipment that includes 5x7 tarps
or blankets, but no glass 5"x7" signal mirrors.

Pete