Vitual memory is used when RAM (Random Access Memory) is full. , , Virtual memory is part of the secondary storage which is used (temporarily) when RAM is full., , Data from RAM is moved to the secondary storage (virtual ram) to make space in RAM, which means RAM can then be filled with new data., , When data in Virtual Memory is needed it is moved back to RAM., , More RAM will improve the performance of the computer if the current RAM is full. , , More RAM will speed up the access to data., , Excessive use can cause disk thrashing which decreases performance., , Disk thrashing describes when a hard drive is being overworked by moving information between the system memory (RAM) and virtual memory excessively., , Virtual memory is slower to access than RAM direct because it has to go back to RAM first., , Moving data between RAM and Virtual Memory takes processor time., , Virtual Memory is needed when there isn't enough physical memory (RAM)., , ROM (read only memory) stores the BIOS (the boot-up instructions)., , ROM stores data that should not be changed., , ROM stores data that must be retained when the computer turns off., , ROM stores firmware and OS (operating system) fundamentals., , RAM stores the operating system, other programs that are running and are in current use, as well as data that is in current use., .

1.2.1 Virtual Memory

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