Hi, I carry two CF cards in my pockets, they both hold some data that I transfer between the home & work PC. I go through lots of metal detectors in airlines, shopping malls, offices, etc. I did not yet have any problem like loosing any data on them. After this tread, sometimes I am wary and left the CF cards along with my PDA and cellphone on the tray near the scanner device. Veli Izzet > I've never tried walking through the metal detector with a > memory card in my pocket. Cards do have metal parts, though > quite small so I don't know if a card would set off the > detector. As I said before, I doubt the field is strong > enough to damage any card but frankly I don't care to test it.