Stabilized recording

Details Stabilized recording Stabilized recording

G - Physics

11

B

352/20

G11B 5/02 (2006.01) G11B 5/48 (2006.01) G11B 5/596 (2006.01) G11B 27/30 (2006.01)

Patent

CA 1135407

STABILIZED RECORDING Abstract of the Disclosure A first signal to be stabilized in a magnetic record member is recorded via a head having a given maximal gap length and pole pieces of high saturation induction. After the first signal is recorded, the magnetic record member is surface erased for stabilizing the just recorded signal. In a preferred form, the surface erasing is performed by AC erasing via a transducer having a gap length less than said maximal gap length. The pole pieces of the erasing head need not have the high saturation induction of the first mentioned head. After such stabilization, signals can be easily recorded and recovered from the magnetic record member by using transducers with gap lengths less than such given maximal gap length and using the normal ferrite heads having a lower saturation induction than the first mentioned heads. The first signal can be advantageously employed as a position indicating signal in a magnetic record member, such as a storage disk or tape. The first signal can also be used for other purposes, such as phase control for recording and in a controlled access or security system. BO978039

363461

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