Stands for “Light-Emitting Diode”, LED is a special semiconductor that illuminates when an electric charge passes through it. LEDs are normally green or reddish can be an array of other colors. Modern advances in LED technology have completed it possible for LEDs to produce white light as well. LEDs are frequently used for indicator lights (such as power on/off lights) on electronic devices.
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The hard disk was invented on September 13, 1956 by IBM team led by Rey Johnson (considered as “father” of the disk drive). Earlier hard disk drives were large and cumbersome devices.