LAYERED PROTECTION SYSTEM FOR COMPUTER'S HARD DISK - Patent 0485417

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EP 0 485 417 A1

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(43)	Date of publication:
	20.05.1992 Bulletin 1992/21

(21)	Application number: 90911217.0

(22)	Date of filing: 10.07.1990

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International Patent Classification (IPC):

G06F 1/ 00^{( . )}
G06F 21/ 00^{( . )}
G11B 20/ 00^{( . )}

G06F 3/ 06^{( . )}
G11B 19/ 04^{( . )}

(86)	International application number:
	PCT/US1990/003865

(87)	International publication number:
	WO 1991/001065 (24.01.1991 Gazette 1991/03)

(84)	Designated Contracting States:
	AT BE CH DE DK ES FR GB IT LI LU NL SE

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Priority:

10.07.1989 US 19890378549

(71)	Applicant: MARTIN MARIETTA ENERGY SYSTEMS, INC.
	Oak Ridge, TN 37831-8243 (US)

(72)	Inventors:
	MORRISON, Gilbert, Wayne Knoxville, TN 37922 (US) MYHRE, Trygre, Chatham Oak Ridge, TN 37830 (US)

(74)	Representative: Thomas, Roger Tamlyn, et al
	D. Young & Co. 21 New Fetter Lane London EC4A 1DA London EC4A 1DA (GB)

(54)	LAYERED PROTECTION SYSTEM FOR COMPUTER'S HARD DISK