Answer: A
USB hard
drive is an external hard
drive that connects via
USB. ... A
USB flash drive, sometimes called a "keychain
drive," also connects to the
USB port on your computer. Unlike a
USB hard
drive, a
flash drive is a "solid state" device, meaning it has no moving parts.
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A flash drive stores data using flash memory. Flash memory uses an electrically erasable programmable read-only (EEPROM) format to store and retrieve data. Flash drives operate in a similar fashion as conventional hard drives. Flash drives are non-volatile, which means they do not need a battery backup.