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----- Original Message ----- From: Holly Dzyban >Sorry, guess I wasn't very clear there, was I? >Our collection will eventually consist of roughly 15,000 Mitsui Gold CD-Rs, each of which holds one >copy of an analog recording. Say 6,000 will be in a semi-closed archive, used only when the mp3 copies >do not have high enough sound resolution for our linguistic researcher. 9,000 will be stored in a >closed archive, only handled to make another CD copy if one of the 6,000 is lost or damaged. Between >the semi-closed and closed archives, we'll have five copies of each recording, each on a separate CD. >Is that enough information? Thanks so much for your help. Do you still have the original analog source recordings, and the hardware on which to reproduce them? If so, and if these are only played in order to be digitized (to digital "masters" which are then copied to provide consumer/user copies), then the survival of your digital copies is relatively unimportant, since you can create more as needed. OTOH, if your concern is having a digital copy which can replace the analog "master" and perform the archival function one the original deterioraytes beyond practical recovery, then you need to know the MBTF for both the analog "masters" and the duigital "altetrnate masters." Steven C. Barr