| 摘要 |
PROBLEM TO BE SOLVED: To maintain the consistency of plural data even at the occurrence of a fault during writing of plural relative data. SOLUTION: A 1st area stores the physical block numbers #00H to #03H of physical blocks constituting a data area in correspondence to respective logical block numbers %00H to %03H. When there is a data writing request in the logical blocks %00H, %02H, for example, the data are respectively written in physical blocks, for example, #04H, #05H being data up-dating blocks out of physical blocks constituting the data area, and the block numbers #04H, #05H of the physical blocks are stored in a 2nd area in correspondence to the logical blocks %00H, %02H. |
