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. 21, 2012
Filed:
Jan. 28, 2010
Applicant:
Kenji Akahoshi, Yokohama, JP;
Inventor:
Kenji Akahoshi, Yokohama, JP;
Assignees:
Hitachi - LG Data Storage, Inc., Tokyo, JP;
Hitachi Consumer Electronics Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B 20/18 (2006.01);
U.S. Cl.
CPC ...
Abstract
To prevent the degradation in read access performance to replacement data caused by not selecting appropriate replacement clusters and to suppress the waste of the number of DFL registrations. Attention is paid to the usage direction of a user data area and that of a replacement area, and in the case where one CRD-type DFL registration can be made collectively in the sequential defect management processes, a replacement area of which the usage direction is the same as that of the user data area is selected.