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For example, [[dynamic memory]] is commonly used for [[primary data storage]] due to its fast access speed. However dynamic memory must be repeatedly [[memory refresh|refreshed]] with a surge of current millions of time per second, or the stored data will decay and be lost. [[Flash memory]] allows for long-term storage over a period of years, but it is much slower than dynamic memory, and the static memory storage cells wear out with frequent use.
Similarly, the [[Bus (computing)|data bus]] is often designed to suit specific needs such as serial or parallel data access, and the memory may be designed to provide for [[parity error]] detection or even [[ECC memory|error correction]] in expensive business systems.
== See also ==
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