Some computer owners, who have only recently begun to master the world of computer technology, may not even suspect that in addition to the operating system and various programs that you can use to work with (double-click - installation - launch), there is still a whole area of partially accessible program codes. It is, of course, about the BIOS (BIOS).
Let's see what bios is. To make it more clear, let's start with an example. Imagine an abstract computer on which to load the Windows operating system. We plug the corresponding power cords into sockets and press the power button on the system unit and ... nothing happens, because since we do not know what bios is, then it does not exist on the board. Think about how the computer can “know” that it is necessary to start the download from a particular hard drive, moreover, a particular one? After all, you can boot from a flash drive, a CD, even on a local network. Why winchester? Therefore, we can assume that somewhere in the computer there is a certain software mechanism that allows you to specify where to start the download.
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