Electrical computers and digital processing systems: memory – Storage accessing and control – Specific memory composition
Reexamination Certificate
2005-02-01
2005-02-01
Elmore, Stephen (Department: 2186)
Electrical computers and digital processing systems: memory
Storage accessing and control
Specific memory composition
C711S154000, C711S155000, C711S162000, C711S165000, C714S006130, C714S052000, C714S054000, C714S746000, C714S758000, C714S768000, C714S773000, C365S228000
Reexamination Certificate
active
06851015
ABSTRACT:
In a nonvolatile memory such as flash memory where data is stored sector by sector, a method of overwriting a data sector is provided. The old data to be overwritten in a data sector along with its error detection code are initially saved to a backup region which is also in a non-volatile area. The old data in the data sector is then erased and new data along with its own error detection code are written into the same data sector where the old data was previously stored. When a power outage occurs during the overwrite process, error checking is performed to determine whether the data in the data sector is valid using the associated error detection code. Because the old data is saved in a non-volatile area, even if such unexpected power outage occurs during the overwrite process and the data in the data sector is determined to be invalid, at least the old data can be recovered from the non-volatile backup region which is not affected by the power outage.
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Akahane Fumihiko
Baba Tsutomu
Elmore Stephen
Reed Smith LLP
Sankyo Seiki Mfg. Co. Ltd.
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