Data corruption detector for magnetic media

Details Data corruption detector for magnetic media Data corruption detector for magnetic media

1993-12-29

1995-12-26

O'Shea, Sandra L.

Electricity: measuring and testing

Magnetic

Magnetic information storage element testing

360132, 324260, G01R 3312, G11B 2302

Patent

active

054790972

ABSTRACT:
A tape cartridge or other physical volume includes a housing configured to accommodate magnetic data storage media, such as a reel of magnetic tape. A magnetic field detector is coupled to the housing for indicating whether the housing has been exposed to a magnetic field of sufficient intensity to corrupt or bulk erase the magnetic media. In a first embodiment, the detector is implemented as a magnetic media element having a predefined pattern of magnetic domains recorded thereon. In a second embodiment, the detector is implemented with a magnetic film element having a predefined pattern of magnetic domains recorded thereon and a polarizing filter stacked on top of the magnetic film element to polarize light incident upon the magnetic film element. Based on the Kerr effect, light incident upon the magnetic domains will undergo a shift in polarization angle before being reflected back to the polarizing filter. Erasure or alteration of the magnetic domains will modify the polarization shift. A dielectric reflector disposed between the polarizing filter and the magnetic film element will multiply the Kerr effect. A reference image is provided for visual comparison of the light reflected from the magnetic domains.

REFERENCES:
patent: 4414650 (1983-11-01), Ohta et al.
patent: 4707756 (1987-11-01), Futamoto et al.
patent: 5239504 (1993-08-01), Brady et al.
patent: 5307228 (1994-04-01), Grasty

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