| 摘要 |
<p>PURPOSE: To decrease a frequency of occurrence of problems caused during deleting data by preventing increase in useless deleting of data in FROM. CONSTITUTION: Means 11, 13 read respectively data A, B written in operation regions 17, 18. A means 14 compares data A with data B; if data A=data B, data is not written in a FROM 3; if both data are different each other, a switch is turned on. When written data A=(A and B), the bloc is not deleted, only different data is written in the FROM 3. Also, when A=(A and B), the means 12 writes data A after deleting data of the bloc. Next, if the next bloc exists, a switch is turned off and processing is finished.</p> |
