| 摘要 |
<P>PROBLEM TO BE SOLVED: To enable proper calculation of a checksum without being conscious of unnecessary data, a free area size or the like before update by making a flash memory store size information about data on a program to be updated and executing the checksum calculation about only a data area of the updated program on the basis of the size information. <P>SOLUTION: This data update method updating data stored astride a sector of an erasure forbidden area of the flash memory of an information processor includes: an update data writing step for writing update data and the size information about the update data into a prescribed storage area of the flash memory; a size information reading step for reading the size information written into the prescribed storage area of the flash memory; and a checksum calculation step for reading data of only the storage area storing the update data on the basis of the size information, and performing the checksum calculation to the data. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
