A hard disk drive (HDD; also hard drive, hard disk, or disk drive) is a device for storing and retrieving digital information, primarily computer data. It consists of one or more rigid (hence "hard") rapidly rotating discs (often referred to as platters), coated with magnetic material and with magnetic heads arranged to write data to the surfaces and read it from them.

Hard drives are classified as non-volatile, random access, digital, magnetic, data storage devices. Introduced by IBM in 1956, hard disk drives have decreased in cost and physical size over the years while dramatically increasing in capacity and speed.

Hard disk drives have been the dominant device for secondary storage of data in general purpose computers since the early 1960s. They have maintained this position because advances in their recording capacity, cost, reliability, and speed have kept pace with the requirements for secondary storage.

Noun

Hard drive

Wikipedia hard drive (plural hard drives)

1. (computing) A device used for storing large amounts of data for a computer that persist while the computer is turned off.

Synonyms

• hard disc, hard disk
• hard disc drive, hard disk drive
• HD, HDD (abbreviation)

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• Unison
  unisonusa.com
  Distributors of hard disk drives, CPU's and other computer hardware products.
• Drive Solutions Inc
  drivesolutions.com
  Carries all types of hard drives new and old, from 270 megabyte to 181 gigabyte.
• CMS Peripherals, Inc.
  cmsproducts.com
  Offers ABS, Automatic Backup System and hard drive upgrades for notebook and desktop systems.