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Virtual memory

Virtual memory is an addressing scheme implemented in hardware and software that allows non-contiguous memory to be addressed as if it is contiguous. The technique used by all current implementations provides two major capabilities to the system:

1.      Memory can be addressed that does not currently reside in main memory and the hardware and operating system will load the required memory from auxiliary storage automatically, without any knowledge of the program addressing the memory, thus allowing a program to reference more (RAM) memory than actually exists in the computer.

2.     In multi tasking systems, total memory isolation, otherwise referred to as a discrete address space, can be provided to every task except the lowest level operating system. This greatly increases reliability by isolating program problems within a specific task and allowing unrelated tasks to continue to process.

 

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