Editing Reading (computer) (section)

=== Magnetic ===
{{main article|Magnetic storage}}
The magnetic medium is found in magnetic tape, hard disk drives, floppy disks, and so on.  This medium uses different patterns of [[magnetization]] in a magnetizable material to store data and is a form of [[non-volatile memory]]. Magnetic storage media can be classified as either [[sequential access memory]] or [[random-access memory]].

[[Magnetic-core memory]] uses toroids (rings) of a hard magnetic material (usually a semi-hard ferrite) as transformer cores, where each wire threaded through the core serves as a transformer winding. Two or more wires pass through each core. Magnetic hysteresis allows each of the cores to store a state.