Storage device
AssigneeSony Corporation
InventorsToshiyuki Nishihara, Takeshi Ishimoto
Life of this patent
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Abstract
A storage device, enabling elimination of redundant write operations of non-selected data and enabling optimization of arrangement of pages to a state efficient for rewriting, having two flash memories which can be accessed in parallel, a page register for acquiring data in parallel from the flash memories and temporarily storing the same, and a control circuit having a built-in RAM in which is constructed an address conversion table for managing correspondence between logical addresses and physical addresses in units of data stored in parallel in the page register, wherein data is rewritten by updating of the address conversion table and additional writing into a storage medium.
Claims6
A storage device comprising:
- a flash memory including a plurality of flash memory units accessed in parallel;
- a page register for acquiring data in parallel from two or more of the plurality of flash memory units and temporarily storing the data;
- and
- an address conversion table for managing correspondence between logical addresses and physical addresses in units of data stored in the page register in parallel;
- the storage device being configured for rewriting data by updating of the address conversion table and additional writing into a storage medium,
- wherein the data has a spare region and that the spare region contains the logical address of the data and information indicating an update history of the data, and
- wherein the spare region is provided with a counter for holding the cumulative number of updates for all logical addresses or the cumulative number of updates for each of the divided logical addresses, and increments the counter number corresponding to the time of the writing of the data into the storage medium.
A storage device comprising:
- an address conversion table showing correspondence between logical addresses and physical addresses;
- and
- a part for storing data according to the address conversion table and rewriting data by updating of the address conversion table and additional writing into a storage medium, wherein
- the data has a spare region,
- that spare region contains the logical address of the data and information indicating an update history of the data, and
- wherein the spare region is provided with a counter for holding the cumulative number of updates for all logical addresses or the cumulative number of updates for each of the divided logical addresses, and increments the counter number corresponding to the time of the writing of the data into the storage medium.
Dependencies are inferred from the claim text.