If you don't delete pics on your computer BUT reformat on your camera, isn't that sufficient? I don't have WG cams but I've been having a few problems. Don't want to hijack the thread either..... I've had some cards (maybe cameras, don't know, can't keep em straight) where a lot of the pictures are "X's" and come on to computer as "error" and are worthless. I kinda wonder if the SD cards are "worn out" so I've dumped a few of them (Older Sandisk cards, 16gb). Do cards "wear out" and could that be the issue? Or is formatting with camera only part of my problem potentially? Once again, sorry for hijack, maybe we have some similar issues & possible solutions?