Examples of magnetic devices - Hard disk, tapes, Examples of optical devices - CD, DVD & Blu-ray, Examples of solid State devices - SSD, SD Memory card, USB Memory sticks, How magnetic devices work - Use magnetic fields to magnetise tiny sections of a disk, How optical devices work - Use a laser to scan the surface of a spinning disc, How solid state devices work - Use non-volatile random access memory (RAM) to store data, Advantage of magnetic - High storage capacity (terabytes of data), Disadvantage of optical - When scratched make data irretrievable, Advantage of solid state - Have fast access times,

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