A hard disk drive is a non volitile, random access, digital magnetic storage device. It features rotating rigid paltters on a motor driven spindle within a proctective closure. Data is magnetically read from and written to the platter by read/write heads that float on a film of air above the platters.
Memory Stick/Flash Drive
Is a data storage device that consists of flash memory with a USB interface. USB flash drives are removeable and rewritable and physically much small than a floppy disk.
CD ROM
CD ROM is an arconym of "compact disc read only memory" is a pre-pressed compact disc that contains data that is accessible to, but not writable by, a computer for data storage and music playback.
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