External hard drive is abbreviated as HDD the drive of the computer’s primary storage media system that completely stores all information about the computer.The drive was initially launched on September 13, 1956 and includes a number of drive platters within air sealed housing.
External hard drives typically have one of two interfaces such as Firewire and USB (Universal serial bus). The primary characteristics of an HDD are its capacity and performance. Capacity is specified in unit prefixes corresponding to powers of 1000: a 1-terabyte (TB) drive has a capacity of 1,000 gigabytes (GB; where 1 gigabyte = 1 billion bytes).
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Alexander Graham Bell (March 3, 1847 – August 2, 1922) was a Scottish-born scientist, inventor, engineer, and innovator who is credited with patenting the first practical telephone.