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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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What is mouse and types

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               Computer Mouse A  computer mouse  is a handheld hardware  input device  that controls a  cursor  in a  GUI  and can move and select  text ,  icons ,  files , and  folders . For desktop computers, the mouse is placed on a flat surface such as a mouse pad or a desk and is placed in front of your computer. The picture to the right is an example of a desktop computer mouse with two buttons and a wheel. Who invented the mouse? The mouse was originally known as the  X-Y Position Indicator  for a Display System and was invented by  Douglas Engelbart  in  1963 while working at  Xerox PARC . However, due to Alto's lack of success, the first widely used application of the mouse was with the  Apple Lisa computer . Today, this pointing device is on virtually every computer. What are the functions of a mouse? Below is a list of each of th...
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