Dear reader, I am the owner of a European model IXUS 400, which is called S400 elsewhere. I am in the market for a large CF card for the camera, and I was wondering if the collective experience of the photo.net membership could assist me. I own a Sandisk 512 MB CF card and I routinely have problems with it. If I fill it up to about 80% capacity and I delete and add images on the card, it stops accepting new pictures. My camera starts warning me about corrupt data. All of those pictures are unrecoverable, although the initial 80% transfers to my computer fine. I remember reading somewhere sometime long ago that Sandisk might be a bad choice for my Canon, but I don't really know much more. Anyway, does anybody have any insight and experience into my first question (as well as maybe some insight into why my Canon and my Sandisk CF are not getting along)?