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How can data be destroyed so no-one can ever recover it?

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Simply deleting a file does not erase the information contain in that file; it just makes the space occupied by that information available to the device to store other data. So, until it is overwritten by information from another file, that deleted data can be recovered using easily-available tools. The military standard for secure data destruction recommends three separate overwrite passes to render data inaccessible; ITS maintains a list of overwriting programs that meet HSU standards for data destruction. These tools take a long time to run and must be verified before the storage device can be declared clear of any recoverable information, so it makes sense to have IT handle this process for you.

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