In the 1950s and 1960s, these methods were largely supplanted by magnetic storage devices such as magnetic core memory, magnetic tapes, drums, and disks, where a bit was represented by the polarity of magnetization of a certain area of a ferromagnetic film, or by a change in polarity from one direction to the other.
Under 1950- och 1960-talet ersattes till stor del dessa metoder med magnetisk lagring såsom kärnminne, magnetband, trumminne och disklagring, där en bit representerades av polariteten av magnetiseringen av en viss del av en ferromagnetisk film, eller genom ett polaritetsskifte från en riktning till den andra.