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All computers are powered by a tiny silicon processor that carries millions of transistors too small to be seen with naked human eyes. The unique feature of the processor is that it can combine the power of the transistors to carry out a huge amount of calculations per second. This is what gives computers their incomparable computing power. Digital devices run a variety of software to harness this power and are able to surpass humans and mechanical devices in terms of performance and quality of work done. Computers generate a large amount of data during their routine operations. To keep this data safe and sound even after the machine has been switched off, a number of data-storage devices have been invented. These differ widely in storage capacity, shape and size as well as price. Their capacity ranges from a mere 1.2 MB of the now-almost-extinct floppy diskette to an enormous 500 GB of a portable hard drive. These storage devices use different technologies to store data. The opt...

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