Isso realmente se resume à versão do firmware BIOS de cada dispositivo em particular (ou à marca e modelo da "máquina" ") e o que o fornecedor que escreveu para oferecer suporte, classifica esses recursos de segurança como e assim por diante.
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De acordo com Ativar senhas do BIOS para extras Segurança as opções em um sistema comum PhoenixBIOS podem ser:
Supervisor Password: Enable and change this password to prevent someone from changing these BIOS settings in the future. For example, if you don't want someone booting from a CD or external drive on one of your work systems, first disable those options in the Boot menu, and then enable the password here. If troubleshooting in the future, you can restore those boot options after entering the BIOS password.
User Password: Add an extra password prompt before getting to the Windows login screen. This provides a small, extra security step against unauthorized access. First set the user password, then enable it on boot.
HDD Password: For the best disk protection short of encrypting your drive, enable the hard disk password. If this option is supported on your system, the password settings are stored on the disk itself, preventing access even if installed in another PC. A data-recovery service could likely still access your files since they're unencrypted. So remember that it's still possible—although quite difficult—for someone else to access the data.
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De acordo com Quantos tipos diferentes de senha você conhece em um PC? referenciando principalmente hardwares de marcas e modelos ThinkPad , eles poderiam ser classificados como:
Power-on password
Power-on PasswordA Power-on password protects the system from being powered on by an unauthorized person. The following is the icon that comes up in the upper left corner if a Power-on password is set:
Normal operation
When the Power-on password has been set, a prompt will appear during the system start up, and the Power-on password must be entered before an operating system can be booted.
Hard drive password
Hard drive passwordThere are two Hard drive passwords: a user Hard drive password for the user and a master Hard drive password for the system administrator. The administrator can use the master password to get access to the hard drive even if a user has changed the user Hard drive password. The following is the icon that comes up in the upper left corner if a Hard disk password is set:
Normal operation
There are two modes for the Hard drive password: user only and master + user. The master + user mode requires two Hard drive passwords; the system administrator enters both in the same operation and provides the user Hard drive password to the system user. If either master + user or user only are set, a the password prompt will appear during the boot process either the master or the user Hard drive password will need to be entered before the operating system can be booted.
Supervisor password (BIOS password)
Supervisor BIOS passwordA Supervisor password protects the system information stored in the BIOS. The user must enter the Supervisor password in order to get access to the ThinkPad BIOS Setup Utility in order to change the system configuration. If the Supervisor password is forgotten there is no way to reset it to enter the BIOS configuration. Setting a Supervisor password automatically sets the master Hard drive password. The following is the icon that comes up in the upper left corner if a Supervisor password is set:
Normal operation
When the Supervisor password is set, then a prompt will appear when entering the ThinkPad BIOS setup utility and the Supervisor password will need to be entered before access will be granted to view or change settings.
Note: Setting the Supervisor password does not prevent access to the operating system. If the user Hard drive password and Power-on password are not set, then setting a Supervisor password will not cause the password prompt to appear when the operating system is booted.