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تعداد صفحه : 24
Hard disk From Wikipedia, the free encyclopedia Jump to: navigation, search Hard Disk Drive An IBM hard disk drive with the metal cover removed. The platters are highly reflective. Date Invented: September 13, 1956 Invented By: Reynold Johnson Connects to: Controller (typically on motherboard) via one of PATA (IDE) interface SATA interface SCSI interface SAS interface Market Segments: Desktop Mobile Enterprise Consumer Other/Miscellaneous The inside of a hard disk drive displaying the actuator arm traveling over the top platter.A hard disk (commonly known as a HDD (hard disk drive) or hard drive (HD) and formerly known as a fixed disk or CKD disk) is a non-volatile storage device which stores digitally encoded data on rapidly rotating platters with magnetic surfaces. Strictly speaking, "drive" refers to a device that drives (removable) media, such as a tape drive or (floppy) disk drive, while a hard disk contains fixed (non-removable) media. [1] However, in recent times, the hard disk has become more commonly known as the "hard drive". Hard disks were originally developed for use with computers. In the 21st century, applications for hard disks have expanded beyond computers to include digital video recorders, digital audio players, personal digital assistants, digital cameras, and video game consoles. In 2005 the first mobile phones to include hard disks were introduced by Samsung Group and Nokia. The need for large-scale, reliable storage, independent of a particular device, led to the introduction of configurations such as RAID, hardware such as network attached storage (NAS) devices, and systems such as storage area networks (SANs)

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