The question has more than one option correct: secondary storage is also known as auxiliary storage or external storage. USB (memory stick) Flash Drive is a secondary data storage device that includes flash memory with an integrated USB interface. USB flash drives are typically removable and rewritable, and physically much smaller than an optical disc. They are often used for the same purposes, for which floppy disks or CDs were used, i.e., for storage, data back-up and transfer of computer files.
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