| 摘要 |
PURPOSE:To attain a preventing system for destruction of data by setting properly an access competence code and a competence code to receive access. CONSTITUTION:An access competence check mechanism 13 reads a physical record to receive a write instruction, extracts a competence code to receive access and given to a control data part of a disk device and compares the access competence code obtained by an access competence recognizing mechanism 12 with the competence code to be receive access and obtained by an adding mechanism 12 for competence to receive access. When the access competence code is equal to or larger than the competence code to receive access, the data are written to a designated physical record. While no write instruction is executed if the access competence code is smaller than the competence code to receive access. Then a fact that no data is written to a program 16 is informed. Thus the mechanism 13 executes no write instruction according to the checking states of both competence codes. This can prevent the destruction of data on a disk device. |
