what is hard disk -
what is portable hard disk-
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A magnetic disk drive that plugs into a USB port on a computer. Used for transport as well as backup and additional storage, portable hard drives rival the capacity of many internal hard drives.
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A hard disk is a data storage device that stores and retrieves digital data using magnetic storage.
an external hard drive, also known as a portable hard drive, is a device that is connected to the outside of a computer through a USB connection that is often used to back up computers or serve as a portable storage solution
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