When you switch on a computer, the first thing that runs up is the BIOS(Basic Input Output System). This is the place where one can select the booting device and select the hardware component to enable and disable. This is the place which decides the booting order. This is the place where a attacker will reach first if he want to log in and see your data.
So if the problem can start before even going to the Operating System, a computer should be protected from that level one. Normally all the BIOS are provided with two level password security.
The other basic security measure you can take care of is setting a password to your hard-disk. Almost every computer is booted from a hard-disk and if the hard-disk is itself password protected. It makes your computer is even more protected.
You can make these password as strong as possible according to the level of security you want for computer. And just make sure to make a note of these passwords.
We will also be talking about recovering these (BIOS and Hard-disk) passwords once you lost them.
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