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IBM manufactured magnetic disk storage devices from 1956 to 2003, when it sold its hard disk drive business to Hitachi. [1] [2] Both the hard disk drive (HDD) and floppy disk drive (FDD) were invented by IBM and as such IBM's employees were responsible for many of the innovations in these products and their technologies. [3]
Longitudinal recording and perpendicular recording, two types of writing heads on a hard disk. Magnetic storage or magnetic recording is the storage of data on a magnetized medium. Magnetic storage uses different patterns of magnetisation in a magnetizable material to store data and is a form of non-volatile memory.
Kennedy Company, often shortened to Kennedy Co., was an American computer storage company active from 1963 to 1988.Founded by Charles J. Kennedy (1920–1996) and based in the Greater Los Angeles area, the company was one of the largest independent manufacturers of magnetic-tape data drives for mainframe and minicomputer users. [1]
www.ibm.com /history /ramac The IBM 305 RAMAC was the first commercial computer that used a moving-head hard disk drive (magnetic disk storage ) for secondary storage . [ 1 ] The system was publicly announced on September 14, 1956, [ 2 ] [ 3 ] with test units already installed at the U.S. Navy and at private corporations. [ 2 ]
Drum memory of a Polish ZAM-41 [] computer Drum memory from the BESK computer, Sweden's first binary computer, which made its debut in 1953. Drum memory was a magnetic data storage device invented by Gustav Tauschek in 1932 in Austria.
By the 1990s the dollar value of magnetic recording devices produced by companies located in California's "Silicon Valley" exceeded the dollar value of semiconductor devices produced there leading some to suggest that a more appropriate name for this area would be "Iron Oxide Valley," after the magnetic material coating the disks. [85]
The recording employs various electronic, magnetic, optical, or mechanical changes to the disk's surface layer. A disk drive is a device implementing such a storage mechanism. Notable types are hard disk drives (HDD), containing one or more non-removable rigid platters ; the floppy disk drive (FDD) and its removable floppy disk ; and various ...
Magnetic-tape data storage is a system for storing digital information on magnetic tape using digital recording. Tape was an important medium for primary data storage in early computers, typically using large open reels of 7-track , later 9-track tape.