Dynamic magnetic information storage or retrieval – Head – Magnetoresistive reproducing head
Reexamination Certificate
2006-03-07
2006-03-07
Miller, Brian E. (Department: 2652)
Dynamic magnetic information storage or retrieval
Head
Magnetoresistive reproducing head
C361S056000, C257S355000
Reexamination Certificate
active
07009820
ABSTRACT:
A disk drive is disclosed comprising a disk and a head actuated over the disk. The head comprising a first head terminal and a second head terminal. The disk drive further comprises an electrostatic discharge (ESD) protection circuit comprising a first depletion mode metal oxide semiconductor field effect transistor (MOSFET) and a second depletion mode MOSFET. A first transistor terminal of the depletion mode MOSFETs are coupled to respective head terminals, and a second transistor terminal of the depletion mode MOSFETs are coupled to ground. The gate terminals of the first and second depletion mode MOSFETs are biased to turn on the depletion mode MOSFETs while the disk drive is powered down, thereby grounding the first and second head terminals to protect the head from ESD.
REFERENCES:
patent: 4800303 (1989-01-01), Graham et al.
patent: 5543650 (1996-08-01), Au et al.
patent: 5587857 (1996-12-01), Voldman et al.
patent: 5644454 (1997-07-01), Arya et al.
patent: 5654574 (1997-08-01), Williams et al.
patent: 5677205 (1997-10-01), Williams et al.
patent: 5712747 (1998-01-01), Voldman et al.
patent: 5757590 (1998-05-01), Phipps et al.
patent: 5771571 (1998-06-01), Voldman et al.
patent: 5811857 (1998-09-01), Assaderaghi et al.
patent: 5877534 (1999-03-01), Williams et al.
patent: 5969523 (1999-10-01), Chung et al.
patent: 5991134 (1999-11-01), Tan et al.
patent: 6233127 (2001-05-01), Shimazawa
patent: 6259573 (2001-07-01), Tsuwako et al.
patent: 6377411 (2002-04-01), Katsumata et al.
patent: 6400534 (2002-06-01), Klaassen
patent: 6424505 (2002-07-01), Lam et al.
patent: 6504424 (2003-01-01), Heminger et al.
patent: 6552879 (2003-04-01), Voldman
patent: 6574078 (2003-06-01), Voldman
patent: 6710983 (2004-03-01), Voldman
patent: 6813122 (2004-11-01), Granstrom
patent: 6891702 (2005-05-01), Tang
patent: 2001/0024348 (2001-09-01), May et al.
patent: 2004/0021997 (2004-02-01), Choo
patent: A 10255235 (1998-09-01), None
patent: WO 99/13510 (1999-03-01), None
Miller Brian E.
Sheerin, Esq. Howard H.
Western Digital Technologies Inc.
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