How many times can a CD-RW be used before it's no longer any good? I have a couple I've been using to temporarily hold sermons or music I listen to when I go to bed. After a day or two, I "erase" the CD so I can put different content on it. Well, this morning I erased a sermon I had on one of the CD's, wanting to put some music on it. When I got ready to burn the CD, I got a message stating that I needed to put a blank CD in the drive, then then again. As far as I knew, then CD was blank because I just erased it. I tried going through the erasing process again, but was informed by my computer that there was nothing to erase. So, figuring it was good to go, I tried the burn again, only to get the same 'please insert blank CD' message. If I had to guess, which is what I'm doing, I'd say that I've used this CD about 15 to 20 times (give or take a few uses). Is that pretty much the life expentency of a CD-RW, or is this just a fluke with this one disc? Thanks for any light you can shed on this prioblem.