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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