| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an external storage device, hardly generating an error at the time of boot data read and high in reliability, by providing plural different blocks, in which boot data are respectively stored, and providing an identification number storage part for storing an identification number showing whether the stored boot data are new or old. SOLUTION: The plural different blocks are provided for respectively storing the boot data. Namely, the storage area of a flash memory is divided into plural blocks to be the units of data erasure. In this case, in these blocks, there are boot blocks for storing the boot data of data to be first read by a data processor 1 when a memory card 2 is started and data blocks for writing arbitrary data. Then, each block storing the boot data is equipped with the identification number storage part for storing the identification number showing whether the boot data stored in that block are new or old.</p> |
