Hard disk drive
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A hard disk drive, hard disk, hard drive, or fixed disk is an electro-mechanical computer data storage device that stores and retrieves digital data using magnetic storage with one or more rigid rapid
A partially disassembled IBM 350 hard disk drive (RAMAC)
Hitachi 500GB 3.5" drive, 2011, opened to show the disk platters and read/write arm
A 3.5" and a 2.5" HDD with front covers removed to show their internals
Recording of single magnetisations of bits on a 200 MB HDD-platter (recording made visible using CMOS-MagView)
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
Hard disk drive
…Modern disks do not have removable media, in contrast to the disk drives common in the 1960s and 1970s. IBM introduced the first disk drive, the 350 for the 305 RAMAC, in 1956, and disks were the dominant secondary storage device for general-purpose computers beginning in the early 1960s. HDDs…
IBM 305 at U.S. Army Red River Arsenal, with two IBM 350 disk drives in the foreground
IBM 1311 disk drive with IBM 1316 removable disk pack at the Computer History Museum
IBM 2311 Disk Storage Drive, with its six platters