4GB non-hc trancend sd card, very lightly used, worked fine for ages in my zaurus, used in my tablet for a few months only, died when I (after carefully umounting/ejecting) put in windows card reader - it immediately had errors. Used a

I have another card which went slightly flakey under the same circumstances, but used panasonic formatter and it's fine. I have no proof but my gut feel is that it was taking it out of the n800 and putting into a windows box with usb card reader that did something odd.