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Pronounced cash, a special highspeed storage mechanism. It can be either a reserved section of main memory or an independent highspeed storage device. Two types of caching are commonly used in personal computers: memory caching and disk caching. A memory cache, sometimes called a cache store or RAM cache, is a portion of memory made of highspeed static RAM (SRAM) instead of the slower and cheaper dynamic RAM (DRAM) used for main memory. Memory caching is effective because most programs access the same data or instructions over and over. Disk caching works under the same principle as memory caching, but instead of using highspeed SRAM, a disk cache uses conventional main memory. When data is found in the cache, it is called a cache hit, and the effectiveness of a cache is judged by its hit rate.
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The area in a computer that serves as temporary storage for programs and data during program execution. The main memory resources directly available to a system’s CPU. Primary memory normally consists of volatile random access memory (RAM) and is a high- performance storage resource available to a system.
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A method of extending computer memory using secondary storage devices to store program pages that are not being executed at the time. A special type of secondary memory that is managed by the operating system in such a manner that it appears to be real memory.
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A type of computer memory that can be accessed randomly; that is, any byte of memory can be accessed without touching the preceding bytes. RAM is the most common type of memory found in computers and other devices, such as printers. There are two basic types of RAM: dynamic RAM (DRAM) and static RAM (SRAM).
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A single chunk of memory that can be moved to and from RAM and the paging file on a hard drive as part of a virtual memory system.
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