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. 05, 2008
Filed:
Nov. 02, 2004
Takashi Chikusa, Odawara, JP;
Seiki Morita, Odawara, JP;
Toshio Tachibana, Atami, JP;
Takehiro Maki, Hadano, JP;
Hirotaka Honma, Chigasaki, JP;
Takashi Chikusa, Odawara, JP;
Seiki Morita, Odawara, JP;
Toshio Tachibana, Atami, JP;
Takehiro Maki, Hadano, JP;
Hirotaka Honma, Chigasaki, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A disk array system is provided, which can improve data reliability by verifying addressing correctness of data access by applying a redundant code to user data even if using an HDD compatible with serial ATA, etc. whose sector length cannot be extended. When writing the object data to an HDD, a controller stores partly-extracted data of the object data in a control area and performs an XOR operation between the partly-extracted data and a check code generated by calculations. Then, the operation-resultant data (CC-embedded data) are returned to the object data and written in the HDD. Also, when reading the object data from the HDD, the controller fetches the CC-embedded data, performs an XOR operation between the fetched data and the check code, and compares and collates the operation-resultant data with the partly-extracted data in the control area to check the addressing correctness and restore the user data.