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In this case, primary storage typically refers to random access memory (RAM), while secondary storage refers to the computer's internal hard drive. RAM, commonly called memory, is considered primary storage, since it stores data that is directly accessible by the computer's CPU.
Typically, primary storage devices have an instance of all the data and applications currently in use or being processed. The computer fetches and keeps the data and files it in the primary storage device until the process is completed or data is no longer required. Random access memory (RAM), graphic card memory and cache memory are common examples of primary storage devices.