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There are several. The Hard Drive is probably the most robust as it does the majority of storage of data. Any internally installed plate based drive uses magnets as opposed to laser to read and write data (laser read/write drives are CD, DVD, Blu-Ray).

In addition, the computers memory card functions as a short term hard drive though I think these are not magnet based, ie putting a memory card up to a magnet will not delete all of the data.

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12y ago

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