Introduced by IBM in 1956, HDDs were the dominant secondary storage device for general-purpose computers beginning in the early 1960s. Modern HDDs are typically in the form of a small rectangular box. HDDs are a type of non-volatile storage, retaining stored data when powered off. Data is accessed in a random-access manner, meaning that individual blocks of data can be stored and retrieved in any order.
The platters are paired with magnetic heads, usually arranged on a moving actuator arm, which read and write data to the platter surfaces. A hard disk drive ( HDD), hard disk, hard drive, or fixed disk, is an electro-mechanical data storage device that stores and retrieves digital data using magnetic storage with one or more rigid rapidly rotating platters coated with magnetic material.
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