| 摘要 |
PURPOSE:To inhibit the information processors other than the appointed from using the same storage medium by storing the proper information different from each other for each information processor to write these information in a replaceable storage medium and reading out the proper information to compare it with the proper information stored in a storage means when the storage medium is loaded into the information processor. CONSTITUTION:When an access instruction is issued to an FD (floppy disk) (S1), an FDD (floppy disk drive) reads the proper information out of the FD (S2). Then a CPU reads the proper information out of a ROM (S3). It is decided whether the relevant proper information was read out of the FD. When the coincidence is confirmed between both proper information, it is decided that the relevant FD has never received any access. Thus the processing proceeds to S9. Then the proper information read out of the ROM is written into the FD, and an access is granted and carried out (S6, S7). If no coincidence is confirmed between both proper information, the processing proceeds to S5. Then an access is granted when the coincidence is secured between the proper information read out of the FD with that read out of the ROM. When no coincidence is secured, no access is granted respectively. |
