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:
Mar. 09, 2010
Filed:
Nov. 15, 2006
Hideki Ohzeki, Kanagawa, JP;
Noboru Yoshida, Kanagawa, JP;
Kazuyuki Ishibashi, Kanagawa, JP;
Tetsuo Ueda, Kanagawa, JP;
Isao Yoneda, Kanagawa, JP;
Toshiaki Wada, Kanagawa, JP;
Hideki Ohzeki, Kanagawa, JP;
Noboru Yoshida, Kanagawa, JP;
Kazuyuki Ishibashi, Kanagawa, JP;
Tetsuo Ueda, Kanagawa, JP;
Isao Yoneda, Kanagawa, JP;
Toshiaki Wada, Kanagawa, JP;
Hitachi Global Storage Technologies Netherlands, B.V., Amsterdam, NL;
Abstract
Detection capability of a servo timing mark (STM) is improved. Long STM is configured by pseudo-STM forming part of an AGC/PLL pattern and intrinsic STM. When a system can not recognize the intrinsic STM, it keeps a state that a sector detection window is opened, and is operated in a long STM detection mode to recognize the long STM, thereby generates an STM detection signal. After the STM detection signal has been generated, an STM detection window is closed, and the system is operated in an intrinsic STM detection mode. Since the long STM has longer bit length than the intrinsic STM, it has high discriminating power with respect to other bit patterns. Therefore, even if the sector detection window is remained to be in an opened state, bit strings of data sector, address information in a servo sector or the like is not falsely recognized.