Data accessing method, device in which the data accessing method is executed and recording medium

A data accessing method wherein the data accessing apparatus writes/reads data to a recording medium in which the data is written per data size that can be increased and decreased stepwise and a data transfer efficiency at writing the data is variable in accordance with the data size, comprising:

• a step in which a parameter showing the data transfer efficiency is previously recorded into the recording medium at writing the data into the recording medium per the data size;
• a step in which the data accessing apparatus transmits a parameter acquisition command to the recording medium at writing/reading the data;
• a step in which the recording medium that received the parameter acquisition command transmits the parameter to the data accessing apparatus;
• a step in which the data accessing apparatus that received the parameter collates the parameter with the data transfer efficiency required in the data to be written/read by the data accessing apparatus to thereby set an optimum data size at writing the data;
• and
• a step in which the data accessing apparatus writes/reads the data between itself and the recording medium based on the set optimum data size.

A data accessing method wherein the data accessing apparatus writes/reads data to a recording medium in which the data is written per data size that can be increased and decreased stepwise and a data transfer efficiency at writing the data is variable in accordance with the data size, comprising:

• a step in which a parameter showing the data transfer efficiency is previously recorded into the recording medium at writing the data into the recording medium per the data size;
• a step in which the data accessing apparatus transmits an information to show the data transfer efficiency required in the data to be written/read by the data accessing apparatus to the recording medium at writing the data;
• a step in which the recording medium that received the information to show the required data transfer efficiency collates the information concerned with the parameter to thereby select an optimum data size at writing the data;
• a step in which the recording medium transmits an information to show the selected optimum data size to the data accessing apparatus;
• and
• a step in which the data accessing apparatus that received the information to show the optimum data size sets the data size at writing the data based on the information showing the optimum data size to thereby write/read the data between itself and the recording medium.