RAM is temporary storage that can be read from or written into by the user. RAM is used primarily to store user and data. The content of RAM is generally volatile, and is lost when power is removed. When the system is powered up, programs and data to be used must be read into RAM through an input devices, Access time for data stored in RAM generally ranges from a microsecond to a few nanoseconds. Some laptop microcomputers utilize special MOS chips that draw almost no power and preserve their contents intently using an internal battery. However, these low-power chips are more expensive than their high-power counterparts.
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