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The magnetic tape could store about 1.1 megabytes on one reel of tape. The type of storage principle is magnetic.
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Hard discs could store 2.52GB and the storage principle is magnetic
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The CDs could store 10 MB and the storage pricipal is optical.
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The DVD could store 4.7 GB and the storage principle is optical
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DVD-RAM discs could store 2.6GB and the storage principal is optical
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Memory sticks could store 8 MB and the storage principle is magnetic
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The Blu-Ray could store 25 GB and the storage principle is optical