Radau gera citata: More modern forms of portable memory, such as SD memory cards and USB flash drives, do not have magnetic films to record data like their floppy-disk forefathers did. As a result, they are immune to interference from external household magnets. "A magnet powerful enough to disturb the electrons in flash would be powerful enough to suck the iron out of your blood cells," said Bill Frank, executive director of the CompactFlash Association.