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:
Oct. 15, 2019
Filed:
Feb. 26, 2014
Hitachi, Ltd., Tokyo, JP;
HITACHI, LTD., Tokyo, JP;
Abstract
A storage device provides a logical space based on a storage medium that is configured by a plurality of logical areas to the higher-level apparatus, and a base data range exists in the storage medium for each logical area. The storage device reads the base data from the base data range that is corresponded to a write destination logical area to which the write destination logical address belongs, and creates difference data that is an exclusive OR of first data that is the base data and second data that is any one of data based on write data and the write data. The storage device creates compressed difference data by compressing the difference data, writes the compressed difference data to the storage medium, and associates a difference data range that is a range in which the compressed difference data has been written with the write destination logical area.