| 摘要 |
<P>PROBLEM TO BE SOLVED: To assure a data transfer rate regardless of performance of a memory card. <P>SOLUTION: Data is written by a data size unit capable of being gradually increased/decreased, and parameters indicating the data size and data transfer efficiency are recorded on a recording medium 101 for which the data transfer efficiency varies according to data size. A data access device 105 has a means 106 for issuing a parameter acquisition command to the recording medium 101, a means 109 which selects the optimum data size by collating the parameter transmitted by the recording medium 101 having received the data acquisition command with the data transfer efficiency required for data as a read/write object, and means 107, 108 for reading/writing data between the recording medium by the selected optimum data size. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
