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Random-access memory, often referred to as RAM, is a temporary data store which is used to store data which the computer is using at the time.
Some laptops have a certain amount of RAM soldered into the motherboard, such as the Fujitsu-Siemens Lifebook B-2131, which has 64MB of RAM soldered; this RAM cannot be removed.
Laptops also have a "hard limit" for RAM. If a laptop has been designed for 2GB of RAM and the user tries to add more RAM, it's possible that the computer won't boot, will randomly crash or become otherwise unstable.