- Physical techniques. The least expensive physical techniques should generate surface deformations in excess of 0.001 inch and preclude normal reading through a disk head. This is sufficient to render attacks planned to recover typical CUI prohibitively costly. Physical techniques include:
- Bending. Bend the disk platters to an internal angle of at least 5 degrees. An abrupt bend is preferred.
- Drilling. Drill holes through platters. Drilling should produce holes greater than 0.25 inch. The outer tracks and most of the remaining tracks should be penetrated.
- Cutting. Cuts should penetrate all tracks of the disk surface. Cuts may be accomplished by physical or thermal means.
- Shredding. Shred to a chip size less than 1.5 inches. Shredding circuit boards to a chip size less than 0.5 inches will also likely damage the flash memory.
- Thermal destruction techniques. Thermal destruction will not only deform the magnetic media but also purge the data contained on the media.
- Incineration or smelting. Heat to a temperature where the substrate melts (aluminum or titanium alloys) or fractures (glass and ceramics).
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