My anecdote re. BD-R: I got the Verbatim "good" discs (made in Taiwan, good dye technology - sorry I forgot the specifics) a while ago and used them to backup data (that fortunately had backups to other places as well). Months later, tried to read them. No dice. I was shocked as I thought BD-R's were built more robustly than DVD+-R's. BTW, this is true of all 3 discs that I tried, albeit they came from the same 50-pack.