METHOD AND APPARATUS FOR AUTHENTICATING MAGNETIC MEDIA

摘要

A method and apparatus are disclosed for determining the remanent noise in a magnetic medium (20, 232) by, for example, dc saturation of a region thereof and measurement of the remaining dc magnetization. A conventional magnetic recording transducer (240) may be used to determine the remanent noise. Upon determination, the remanent noise may then be digitized and stored on the same magnetic medium (232), magnetic medium. This "fingerprint" may then be later used to verify and authenticate (252) the magnetic medium as being an original.