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Off-line storage is computer data storage on a medium or a device that is not under the control of a processing unit. [9] The medium is recorded, usually in a secondary or tertiary storage device, and then physically removed or disconnected. It must be inserted or connected by a human operator before a computer can access it again.
The binary definition uses powers of the base 2, as does the architectural principle of binary computers. This usage is widely promulgated by some operating systems, such as Microsoft Windows in reference to computer memory (e.g., RAM). This definition is synonymous with the unambiguous unit gibibyte.
Units are defined as multiples of a smaller unit except for the smallest unit which is based on convention and hardware design. Multiplier prefixes are used to describe relatively large sizes. For binary hardware , by far the most common hardware today, the smallest unit is the bit , a portmanteau of binary digit, [ 1 ] which represents a value ...
There is some disagreement regarding the difference between data at rest and data in use.Data at rest generally refers to data stored in persistent storage (disk, tape) while data in use generally refers to data being processed by a computer central processing unit or in random access memory (RAM, also referred to as main memory or simply memory).
Any general-purpose computer whose size, capabilities, and original sales price make it useful for individuals, and which is intended to be operated directly by an end user, with no intervening computer operator. power supply A unit of the computer that converts mains AC to low-voltage regulated DC for the power of all the computer components.
Density is a measure of the quantity of information bits that can be stored on a given physical space of a computer storage medium. There are three types of density: length ( linear density ) of track , area of the surface ( areal density ), or in a given volume ( volumetric density ).
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EDSAC—Electronic Delay Storage Automatic Calculator EDVAC —Electronic Discrete Variable Automatic Computer EEPROM —Electronically Erasable Programmable Read-Only Memory