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Computer data storage or digital data storage is a technology consisting of computer components and recording media that are used to retain digital data. It is a core function and fundamental component of computers. [1]: 15–16. The central processing unit (CPU) of a computer is what manipulates data by performing computations.
v. t. e. Data storage is the recording (storing) of information (data) in a storage medium. Handwriting, phonographic recording, magnetic tape, and optical discs are all examples of storage media. Biological molecules such as RNA and DNA are considered by some as data storage. [1][2] Recording may be accomplished with virtually any form of energy.
Optical storage is the storage of data on an optically readable medium. Data is recorded by making marks in a pattern that can be read back with the aid of light, usually a beam of laser light precisely focused on a spinning optical disc. An older example of optical storage that does not require the use of computers, is microform.
Disk storage (also sometimes called drive storage) is a data storage mechanism based on a rotating disk. The recording employs various electronic, magnetic, optical, or mechanical changes to the disk's surface layer. A disk drive is a device implementing such a storage mechanism. Notable types are hard disk drives (HDD), containing one or more ...
HDDs are a type of non-volatile storage, retaining stored data when powered off. [2][3][4] Modern HDDs are typically in the form of a small rectangular box. Hard disk drives were introduced by IBM in 1956, [5] and were the dominant secondary storage device for general-purpose computers beginning in the early 1960s.
Mass storage includes devices with removable and non-removable media. [1][2] It does not include random access memory (RAM). There are two broad classes of mass storage: local data in devices such as smartphones or computers, and enterprise servers and data centers for the cloud. For local storage, SSDs are on the way to replacing HDDs.
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