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Cylinder-mode read/write operations were supported, while the heads flew about 250 micro-inches above the platter surface.
Users could buy additional packs and interchange them as needed, much like reels of magnetic tape.is a data storage device used for storing and retrieving digital information using one or more rigid rapidly rotating disks (platters) coated with magnetic material.The platters are paired with magnetic heads arranged on a moving actuator arm, which read and write data to the platter surfaces.Data is accessed in a random-access manner, meaning that individual blocks of data can be stored or retrieved in any order and not only sequentially.HDDs are a type of non-volatile memory, retaining stored data even when powered off.Introduced by IBM in 1956, HDDs became the dominant secondary storage device for general-purpose computers by the early 1960s.
Continuously improved, HDDs have maintained this position into the modern era of servers and personal computers.More than 200 companies have produced HDDs historically, though after extensive industry consolidation most current units are manufactured by Seagate, Toshiba, and Western Digital.As of 2016, HDD production (in bytes per year) is growing, although unit shipments and sales revenues are declining.The primary competing technology for secondary storage is flash memory in the form of solid-state drives (SSDs), which have higher data-transfer rates, higher areal storage density, better reliability, The primary characteristics of an HDD are its capacity and performance.Capacity is specified in unit prefixes corresponding to powers of 1000: a 1-terabyte (TB) drive has a capacity of 1,000 gigabytes (GB; where 1 gigabyte = 1 billion bytes).Typically, some of an HDD's capacity is unavailable to the user because it is used by the file system and the computer operating system, and possibly inbuilt redundancy for error correction and recovery.