(19)

(11)

EP 0 282 573 A1

(12)

(43) Date of publication: 21.09.1988 Bulletin 1988/38 (21) Application number: 87906538.0 (22) Date of filing: 18.09.1987

(51) International Patent Classification (IPC):  G11B 5/ 64( . ) (86) International application number: PCT/US1987/002390 (87) International publication number: WO 1988/002167 (24.03.1988 Gazette 1988/07)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 19.09.1986 US 19860909358 19.09.1986 US 19860909357 (71) Applicant: Unisys Corporation Blue Bell Pennsylvania 19424 (US)	(72) Inventors: HERTE, Lawrence Palo Alto, CA 94306 (US) VAN DE PITTE, Steven San Jose, CA 95136 (US) BARAL, Debasis San Jose, CA 95112 (US) LEE, Hyung, Jai San Jose, CA 95136 (US) (74) Representative: Eisenführ, Speiser & Partner  Martinistrasse 24 D-28195 Bremen D-28195 Bremen (DE)