The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 27, 1998
Filed:
Nov. 08, 1994
Norio Nakamura, Yokohama, JP;
Yusuke Ohinata, Tokyo, JP;
Junichi Akiyama, Kawasaki, JP;
Nobuyasu Goto, Tokyo, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A magnetic disk drive system for writing data into a disk-shaped magnetic medium and reading data stored therein, comprises a first terminal, a second terminal, and at least one third terminal, a composite head unit including an inductive write head and at least one magnetoresistive read head which are connected in series between the first and second terminals, and at least one common connection node connected to the at least one third terminal, and a driving circuit connected to the first through third terminals. The driving circuit includes a write circuit for supplying a write current to the write head, a read circuit for supplying a sense current to the read head to generate a read signal, and a plurality of switches for connecting the write circuit to the write head and electrically disconnecting the read circuit from the composite head unit and the write circuit during writing, and for connecting the read circuit to the read head and electrically disconnecting the write circuit from the composite head unit and the read circuit during reading.