an instrumentality invented for a particular purpose

A data storage device is any device for recording (storing) information (data).

a storage device consisting of acoustic delay lines

a data storage device that is not the main memory of a computer

(computer science) a part of RAM used for temporary storage of data that is waiting to be sent to a device; used to compensate for differences in the rate of flow of data between components of a computer system

(computer science) a memory device consisting of a flat disk covered with a magnetic coating on which information is stored

memory device consisting of a long thin plastic strip coated with iron oxide; used to record audio or video signals or to store computer information