Hi: I don't have any experience with this, but my thought, too, is that since the command for reformatting the card is the 4 corner keys, they could have thrown it down in such a way as to have activated that command. If it bounced, then it reformatted the card. It's a stretch, but it would explain why it happened. Pamela Rader, TECHNICAL SUPPORT American Printing House For The Blind 1839 Frankfort Ave. Louisville, KY 40206 PHONE: 1-800-223-1839, Ext. 307 >>> morgan@xxxxxxxxxxx 03/25/08 01:25PM >>> Just a thought... I've been reading the posts about the loss of book files from a CF card after going through the X-ray machine in an airport. Sounds like an event that is not terribly likely to happen again. I've been on many hundreds of flights with my BookPort and always leave it in my briefcase which goes through the X-ray machine. I've never had a problem. I wonder if the problem might have been cause by something else is that the file structure on the card, albiet without book files, appeared OK, that is, it didn't seem to need reformatting. Wouldn't the card tell you that it needed formatting rather than there were no files -- I don't know the answer to that one. And, it did sound as though the Help file was intact. My gut says that repeatedly removing a CF card is potentially harder on the BookPort, card slot, and the CF card. If left in a purse, it'll go through X-rays anyway, and in a wallet, it can take a bit more of a beating if sat upon.