(19)

(11)

EP 0 139 722 A1

(12)

(43) Date of publication: 08.05.1985 Bulletin 1985/19 (21) Application number: 84901672.0 (22) Date of filing: 29.03.1984

(51) International Patent Classification (IPC):  G11B 5/ 54( . ) G11B 21/ 02( . ) G11B 7/ 08( . ) (86) International application number: PCT/US1984/000488 (87) International publication number: WO 1984/003985 (11.10.1984 Gazette 1984/24)

(84) Designated Contracting States: FR GB (30) Priority: 04.04.1983 US 19830481962 (71) Applicant: STORAGE TECHNOLOGY PARTNERS II Louisville Colorado 80028 (US)	(72) Inventors: RICKERT, David, W. Boulder, CO 80302 (US) WILKINSON, Richard, A., Jr. Boulder, CO (US)