Just as a follow up, I've tried Sony and TDK DVD-Rs and am having similar problems. The burn process (tried Nero and Roxio) goes fine and the disc reads okay to start with.

However if I try it a couple of weeks later on a different drive it can't read the disc, tells me its corrupt. I store the discs carefully in boxes so they're not scratched or anything. I've already lost a significant amount of data to these rogue DVD's

If they do read its only ever on the drive that created them.