I just started checking a lot of my CD-R's, to see if they are still readable. A lot of my discs are just personal copies of my games. All my game backup discs are mostly on cheap Memorex CD-R and were burned using a Yamaha 20x writer.
I'm using Nero scanDisc and have found two discs so far that have unreadable sectors, several others have "damaged" sectors. Nero reported on one disc about 98% good sectors, .25% damaged, 1.24% unreadable. The discs have been stored away and have no scratches on them. These discs were completely readable before I stored them away for safekeeping!
This is a warning for those that are using these discs. So far all Fuji TY discs I've tested are still good!