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Flash memory management method that is resistant to data corruption by power loss

Image Number 3 for United States Patent #7275140.

The present invention includes a method of managing page-based data storage media such as flash media, a system that uses the method, and a computer-readable storage medium bearing code for implementing the method. For each page, a corresponding risk zone, of other pages whose data are put at risk of corruption if writing to the page is interrupted, is identified. When a page is selected for writing new data, the written pages in its risk zone are copied to a log. As necessary, corrupt data are replaced with corresponding data from the log.

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