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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.
Although it has a much lower access time and faster performance, it is also about two orders of magnitude more costly than secondary storage. Random Access Memory (RAM) and cache are both examples of a primary storage device. The image shows three different types of storage for computer data. Primary storage's key differences from the others are that it is directly accessible by the CPU, it is volatile, and it is non-removable.