what is the use of external hard disk
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An external hard drive is a portable storage device that can be attached to a computer through a USB or FireWire connection, or wirelessly. External hard drives typically have high storage capacities and are often used to back up computers or serve as a network drive.
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External hard drives plug into a computer, usually by USB connection, and can contain massive amounts of data separate from a computer's internal hard drive, which makes them great for backing up large amounts of work
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