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> On the second point, it is possible to extract previously written data even if it has been overwritten with disassembly of the harddrive and speacial tools.

Has this ever been demonstrated?

Here is a paper about it:


"The purpose of this paper was a categorical settlement to the controversy surrounding the misconceptions involving the belief that data can be recovered following a wipe procedure. This study has demonstrated that correctly wiped data cannot reasonably be retrieved even if it is of a small size or found only over small parts of the hard drive. Not even with the use of a MFM or other known methods. The belief that a tool can be developed to retrieve gigabytes or terabytes of information from a wiped drive is in error."

Thanks, that is an excellent paper.

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