First error-processing data are generated with respect to a predetermined amount of data, and second error-processing data are generated with respect to each of a plurality of blocks produced by dividing the predetermined amount of data. Data of record units are generated from the predetermined...http://www.google.com.tw/patents/US5835509?utm_source=gb-gplus-share專利 US5835509 - Method of and apparatus for recording and reproducing data and transmitting data 
