![]() It is always slower to access data from secondary storage than from memory.Any changes to the files are copied back to secondary storage from RAM before the computer is closed down ( saving). When a computer is running, the programs and data files in use are copied from the secondary storage into RAM ( loading) so the CPU can access them at an acceptable speed. Secondary storage may also need to have a larger storage capacity than RAM if it needs to store operating system (OS) files, other program files and data files. Secondary storage must therefore be non-volatile, meaning it retains its contents without the need for a power supply. ![]() ![]() select suitable storage devices and storage media for a given application and justify their choice using characteristics such as capacity, speed, portability, durability and reliability.Īlthough RAM can store the data and program files used when a computer system is actually running, it is volatile, meaning it loses its contents without a power source.Ī secondary storage device is needed in a computer system to store data and program files when the power supply is turned off.describe common storage technologies such as optical, magnetic and solid state. ![]()
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