Hardware - physical parts of a computer system that you can touch, Magnetic - storage makes use of a magnetisable coating, Optical - makes use of a laser to shine and reflect light to read the data stored, Hard Disk - Magnetic form of backing storage, CD - Optical form of Stoarage, Solid state - Storage with no moving parts, USB Drive - Solid state device, Backing storage - Needed because the contents of RAM are lost, Capacity - how much data device is capable of storing., Data transfer speed - The speed of a storage device is also known as, Hertz - Processor Speed Measurement, ROM - Programs are stored permantly, RAM - Contents lost when computer turned off,

Computer Systems

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