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HHD password and supervisor password

I have  a Dell Studio 1640.  Bios A11.


I want to set a password for my hard drive and also a password on the bios.  But when I go into security, it says on the right side that if I set the HHD password I can't set the supervisor password.  And the opposite.


So, how do I do this?  I'm just baffled by the information in the right side of the screen.


Thank you for help.

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