Well, a ways back there was a discussion here about the longevity & quality of various brands of CD-Rs, so I thought I'd pass this along. I never used a lot of TDK discs, but all the ones I burned back in the late 90's are starting to crap out, despite being properly stored, never taken out of the house nor exposed to light, stored at/near 70 degrees F year round, etc.
I can't say whether this was a "bad batch" or not- all the discs are from the same couple packages, and as I said, I never used a lot of TDKs. But CD-R is a mature enough technology that most of us have discs that are getting on a decade or so old. Has anyone gone thru their oldest ones to see how many still work?
So far, my old Memorex haven't held up well at all, long term. Luckily none of my TDK or old Memorex discs have anything irreplaceable- well, actually I have one TDK that had some stuff that was pretty important, but fortunately while it had deteriorated to the point that my DVD and CD players didn't care for it, my computer's CD-ROM drive managed to extract the WAV.file just fine (thanks, EAC!).