Power-on password
When a power-on password is set, you are prompted to enter a valid password each time the computer is turned on. The computer cannot be used until the valid password is entered.
Administrator password
Setting an administrator password deters unauthorized users from changing configuration settings. If you are responsible for maintaining the configuration settings of several computers, you might want to set an administrator password.
When an administrator password is set, you are prompted to enter a valid password each time you try to access the Setup Utility program. The Setup Utility program cannot be accessed until a valid password is entered.
If both the power-on password and administrator password are set, you can enter either password. However, you must use your administrator password to change any configuration settings.
Hard disk password
Even if the storage drive is removed from one computer and installed in another, the hard-disk password is still valid.
If the hard disk password is forgotten, there is no way to reset the password or recover data from the storage drive.