A hard drive read/write head at the Defense Computer Forensic Laboratory Sept. 9, 2010, in Linthicum, Md. Read/write heads ride on a microscopic layer of air that develops on the surface of the platter(s), some that spin up to 10,000 rotations per minute inside a hard drive. The slightest touch of a head onto a platter disk will cause physical damage and render that side of the disk unreadable.
U.S. Air Force photo/Lance Cheung
November 3, 2012
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