Bulk eraser including at least three magnets configured for...

Details Bulk eraser including at least three magnets configured for... Bulk eraser including at least three magnets configured for...

2011-05-17

2011-05-17

Negrón, Daniell L (Department: 2627)

Dynamic magnetic information storage or retrieval

General recording or reproducing

Specifics of biasing or erasing

C360S137000

Reexamination Certificate

active

07944640

ABSTRACT:
A bulk eraser for erasing recorded information on a magnetic-recording disk. The bulk eraser includes at least three magnets and a structure magnetically coupled with the at least three magnets to produce magnetic-flux density in a gap. The gap has a first portion, a second portion and a third portion, such that a first magnet and a second magnet are disposed with opposing end poles across the first portion. The at least three magnets and the structure are configured to produce a magnetic-flux density in the second portion sufficient to erase recorded information from a portion of at least one magnetic-recording disk in a disk-stack when a hard-disk drive is inserted into the second portion. In addition, the at least three magnets and the structure are configured to direct the magnetic-flux density in a substantially radial direction of the portion of the magnetic-recording disk in the second portion.

REFERENCES:
patent: 5132860 (1992-07-01), Von Stein
patent: 6594099 (2003-07-01), Serizawa
patent: 6714398 (2004-03-01), Schultz
patent: 7092188 (2006-08-01), Price et al.
patent: 2007/0247945 (2007-10-01), Yoon
patent: 2007/0247946 (2007-10-01), Yoon

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