A Compact Disk Read Only Memory disk cannot be used as a virtual memory, because it is a read-only memory format. Virtual Disk is a method of using the Random Access Memory on the motherboard to simulate a Random Access disk drive, but with much faster access times than is possible for a peripheral device. (One which is not on the motherboard.) Windows uses a virtual memory routine to set aside part of the hard disk drive for additional storage in case the onboard RAM becomes too full to allow rapid processing. Data which is not being manipulated immediately is moved to this section of the hard disk, and then moved back when the processor is ready for it. This allows faster multitasking when using a machine with a small amount of onboard RAM.
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