On Thu, 14 Dec 2000 brflgnk@cotse.com wrote:

Not being familiar with NMR, I wonder if it would be equally effective on CD-ROM, CD-R and/or CD-RW. CD-ROM has a solid physical geometry to it, but recordables would be less physically definite, I'd think. Antidote to my ignoragce is welcome.

There is all kinds of info no NMR and related technologies on the web. Try google.com and use 'NMR'. In general the material under examination has some intrinsic property that can be measured using EM fields. By measuring the magnitude/transmissivity of the signal through the material one can map that material. The precision is enough to rival x-rays and that sort. The distinction between the phases of the CD material in it's two states (eg density) would interfere in different ways. So the fact that one CD might be re-writable more than once isn't important with respect to what is written on it now (though one could probably do bit archeology just like on magnetic media). ____________________________________________________________________ Before a larger group can see the virtue of an idea, a smaller group must first understand it. "Stranger Suns" George Zebrowski The Armadillo Group ,::////;::-. James Choate Austin, Tx /:'///// ``::>/|/ ravage@ssz.com www.ssz.com .', |||| `/( e\ 512-451-7087 -====~~mm-'`-```-mm --'- --------------------------------------------------------------------