| 摘要 |
PROBLEM TO BE SOLVED: To securely prevent illegal access to data and a program, which are stored in an exchangeable storage medium such as an optical disk, by permitting the access of the exchangeable storage medium to a data area with the designation of a password and setting the inhibition of writing/reading to respective users. SOLUTION: In a password setting operation, a drive device 2 writes an inputted master password, a user password, a user name list and the like into an area except the data area of an optical disk 3 and reports the normal termination of a command to a host device 5. The master password is installed for restricting access to the optical disk 3 and the change of the user password is permitted with the designation of the master password. The user password is provided in common for a plurality of users and the access of the optical disk 3 to the data area is permitted with the designation of the password. The inhibition of writing into the data area is set for the respective users. |
