I've been using RiData disks for a while now and haven't had any problems with them, but a lot of my older disks are starting to give me pains. Some of the copies that I made a couple of years ago simply won't play anymore. I get a 'disks of this type are not accepted' error on my DVD player. I know that I burned it properly because I watched the movie after I burned it. I'm finding this is happening more and more frequently. This is a bit of a problem as I have over a thousand copies made to date. First, it'd be a pain to go through them all to check which ones are good. Second, re-copying the ones that aren't good could be a problem. Do disks deteriorate over time or am I losing my mind? Are the two mutually exclusive?