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Desktop Board Features 
23 
Security Passwords 
The BIOS includes security features that restrict whether the BIOS Setup program can 
be accessed and who can boot the computer.  A supervisor password and a user 
password can be set for the BIOS Setup and for booting the computer, with the 
following restrictions:   
•  The supervisor password gives unrestricted access to view and change all Setup 
options.  If only the supervisor password is set, pressing <Enter> at the password 
prompt of Setup gives the user restricted access to Setup. 
•  If both the supervisor and user passwords are set, you must enter either the 
supervisor password or the user password to access Setup.  Setup options are then 
available for viewing and changing depending on whether the supervisor or user 
password was entered. 
•  Setting a user password restricts who can boot the computer.  The password 
prompt is displayed before the computer is booted.  If only the supervisor 
password is set, the computer boots without asking for a password.  If both 
passwords are set, you can enter either password to boot the computer. 
For instructions on resetting the password, see Clearing BIOS Security Passwords on 
page 60. 
Hard Disk Drive Passwords 
The hard disk drive password security feature will lock a particular drive from read or 
write accesses until the hard disk drive password is entered at the startup prompt.  
Passwords are set in BIOS Setup under the “Security” heading, but do not interact 
with other system passwords. 
There are two levels of hard disk drive passwords:  Master and User.  Both the Master 
and User hard disk drive passwords can be used to unlock a locked drive.  Valid 
passwords are between two and eight characters. 
The passwords function as follows: 
•  The User hard disk drive password will lock the drive and block read and write 
accesses to a hard disk upon each power cycle or reset. 
•  The Master hard disk drive password by itself will not lock the drive, but instead 
acts as an unlock override in the event that the User hard disk drive password is 
unavailable.  Only the installation of the User hard disk drive password will cause a 
hard disk to be locked upon a system power cycle or reset. 
For convenient support of S3 resume, the system BIOS will automatically unlock drives 
on resume from S3 and will not prompt for a hard disk drive password. 
 
NOTE 
The BIOS hard disk drive password security feature can only be used on ATA hard 
disks that support the ATA Security Mode feature set.  It supports Serial ATA hard disk 
drives in IDE, AHCI, and RAID modes. 
For instructions on resetting the password, see Clearing or Changing Hard Disk Drive 
Passwords
 on page 61.