Sony VGN-BX500 - Manual (Page 117)

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Customizing Your VAIO Computer
Setting the Password
You can use BIOS functions to set two types of passwords to protect your computer: power-on password and hard disk
password.
Once you have set the power-on password, you will have to enter the password after the VAIO logo appears to start your
computer. In this way, you can protect your computer from unauthorized access.
The hard disk password provides additional security for the data stored in your hard disk. If you set the hard disk password,
no other users will be able to access the data without knowing the password, even if the hard disk is installed in another
computer.