Drake & Rockman are both right.Gold cdr's are the best & those are two of the best companies to get them from.There is a debate concerning any improvement in sound quality but,it is widely accepted by researchers that gold cdr's & dvd-r's will,by far,last the longest.150 years is the low estimate.These are the discs that major corporations,hospitals,and governments use to archive important data.The 74 minute discs are more reliable than most 80 minute discs in general although E-Film ( [
www.delkin.com] ) has just introduced 80 minute/700 MB gold cdr's.They also now offer gold discs with a Scratch Armour scratch protection layer as well as their standard gold discs.There are more & more companies,including Kodak & Quantegy,starting to sell gold discs.They all should last at least 150 years.
As far as non-gold discs go,the ones made in Japan are the best.The problems with these non-gold discs usually don't arise immediately.It's just that they could very well become unreadable after 15-25 years,maybe even less,a little more if you're fortunate.
Personally,I go with gold discs because,that's one less thing I have to worry about with my cdr collection.I don't have to keep track of which discs I need to re-copy every ten or fifteen years.
Here's a link to another recent discussion on this topic : [
iorr.org]