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Hard Disk - Hard Drive
This is your computers main storage device, this is where you would normally keep your programs and files. These devices contain platters (disk like objects) that rotate at speeds of 5400 rpm and above, there is a device called an actuator that can be likened to an arm which moves across the platters and reads or writes the information through the use of READ/WRITE heads. the gap between the READ/WRITE heads and the platter is typically a lot less than the thickness of a human hair. The platters are made from an aluminium substance, these devices are a lot more reliable now than they used to be, although they can break down mechanically if you drop them !!!!.
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