| 摘要 |
PROBLEM TO BE SOLVED: To propose a storage device and a data deduplication method which effectively uses a flash memory, while extending the life of the flash memory as a storage medium. SOLUTION: This storage device performs deduplication of eliminating duplicated data by storing a logical address of one or more corresponding logical unit areas, in a prescribed management information storage area of a physical unit area defined in a storage area provided by a flash memory chip, and executes restoration of managing usage as a total number of logical addresses stored in the management information storage area and a duplication degree as the number of valid logical addresses corresponding to the physical unit area for each of the physical unit areas, and restoring the physical unit area wherein a difference between the usage and the duplication degree exceeds a default value, to an initial state. COPYRIGHT: (C)2009,JPO&INPIT |
