IBM manufactured magnetic disk storage devices from 1956 to 2003, when it sold its hard disk drive business to Hitachi. Both the hard disk drive and floppy disk drive were invented by IBM and as such
IBM 305 at U.S. Army Red River Arsenal, with two IBM 350 disk drives in the foreground
RAMAC mechanism at Computer History Museum
IBM 1311 disk drive with IBM 1316 removable disk pack at the Computer History Museum
IBM 2311 Disk Storage Drive, with its six platters
IBM 7070 is a decimal-architecture intermediate data-processing system that was introduced by IBM in 1958. It was part of the IBM 700/7000 series, and was based on discrete transistors rather than the
IBM 7074
IBM 7070 transistor circuit SMS boards