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Hard disk

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Hard disk drive A  hard disk drive  ( HDD ),  hard disk ,  hard drive  or  fixed disk [b]  is a  data storage device  that uses  magnetic storage  to store and retrieve  digital  information using one or more rigid rapidly rotating disks ( platters ) coated with magnetic material. The platters are paired with  magnetic heads , usually arranged on a moving  actuator  arm, which read and write data to the platter surfaces. [2]  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 storage , retaining stored data even when powered off. [3] [4] [5] Hard disk drive Hard disk drive A hard disk is part of a  DEFINITION                           hard disk , oft...
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Heat sink

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                        Heat sink A  fan-cooled   heat sink on the processor of a personal computer. To the right is a smaller heat sink cooling   another integrated circuit   of the motherboard. A  heat sink  (also commonly spelled  heatsink [1] ) is a passive  heat exchanger  that transfers the heat generated by an electronic or a mechanical device to a  fluid  medium, often air or a liquid coolant, where it is  dissipated  away from the device, thereby allowing regulation of the device's temperature at optimal levels. In computers, heat sinks are used to cool  central processing units  or  graphics processors . Heat sinks are used with high-power semiconductor devices such as power  transistors  and optoelectronics such as lasers and light emitting diodes (LEDs), where the heat dissipation ability of the component itself is ...
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