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.