Things can happen to hard drives...esp. in areas where you get a lot of electrical storms or have a ratty electric company. At least CDs don't get trashed with a lightning strike.
"Holy shit! I wish I had that many!", you should know that most were gathered free through various yahoo groups, etc...though we do have a good number of them from pay sites as well. And before anyone asks...sorry but they aren't able to be shared at this point. But, once life settles down and I have time to get them organized, I do plan to get them better organized and share those that aren't restricted. The mainstream ones will come first. No telling how soon this will be, though.