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:
Feb. 03, 2009
Filed:
Jan. 27, 2005
Sumie Takeda, Kanagawa, JP;
Akira Kojima, Kanagawa, JP;
Mitsuharu Horiuchi, Kanagawa, JP;
Shinichi Kobayashi, Kanagawa, JP;
Sumie Takeda, Kanagawa, JP;
Akira Kojima, Kanagawa, JP;
Mitsuharu Horiuchi, Kanagawa, JP;
Shinichi Kobayashi, Kanagawa, JP;
Hitachi Global Storage Technologies Netherlands B.V., AZ Amsterdam, NL;
Abstract
Embodiments of the invention relate to diagnosing error-correcting retries of an upper system by using a disk drive under control of the upper system. In one embodiment, a microprocessor can operate in any of at least two operation modes. One is normal operation mode while the other is pseudo failure operation mode. Mode switching is made by a switch. Strictly, the pseudo failure operation mode includes three different operation modes: 1) pseudo logical error report mode in which a pseudo logical error is reported to the upper system without performing disk control; 2) pseudo component circuit failure mode in which a control circuit is forced to cause a failure by setting invalid control values to the control circuits; and 3) pseudo interface failure mode in which a pseudo interface failure in the system comprising multiple disk drives is reported by setting an invalid control value to the interface control circuit.