Electrical computers and digital processing systems: memory – Storage accessing and control – Specific memory composition
Reexamination Certificate
2008-01-28
2010-10-19
Bragdon, Reginald G (Department: 2189)
Electrical computers and digital processing systems: memory
Storage accessing and control
Specific memory composition
C711S162000, C711SE12009, C711SE12103, C711S159000
Reexamination Certificate
active
07818495
ABSTRACT:
This storage device performs deduplication of eliminating duplicated data by storing a logical address of one or more corresponding logical unit memory areas in a prescribed management information storage area of a physical unit memory area defined in the storage area provided by the flash memory chip, and executes a reclamation process of managing a use degree as the total number of the logical addresses used stored in the management information storage area and a duplication degree as the number of valid logical addresses corresponding to the physical unit memory area for each of the physical unit memory areas, and returning the physical unit memory area to an unused status when the difference of the use degree and the duplication degree exceeds a default value in the physical unit memory area.
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Mizuno Makio
Nakamura Shuji
Tanaka Katsuya
Bragdon Reginald G
Faal Baboucarr
Hitachi , Ltd.
Volpe and Koenig P.C.
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