Noun
(computer science) a memory device consisting of a flat disk covered with a magnetic coating on which information is stored
Source: WordNetAnother LED/photo-transistor pair located near the center of the disk detects the index hole once per rotation in the magnetic disk; it is used to detect the angular start of each track and whether or not the disk is rotating at the correct speed. Source: Internet
Magnetic disk storage DEC was both a manufacturer and a buyer of magnetic disk storage, offering more than 100 different models of hard disk drive (HDD) and floppy disk drive (FDD) during its existence. Source: Internet
More importantly, a text could be edited, for instance a paragraph moved to a new place, or a spelling error corrected, and these changes were recorded on the magnetic disk. Source: Internet