Accessing BIOS/ROM: The boot sequence begins by accessing the computer's BIOS on Windows PCs or the system ROM on a Macintosh.The sequence of events in the boot sequence is as follows: It also specifies the order in which the computer’s devices are checked. What is a Boot Sequenceĭuring the boot process, the computer checks itself to be sure all is well, loads some minimal operational software and loads the operating system.Įach time a computer boots up, it goes through an initial series of processes, or sequence of events, which is aptly named a 'boot sequence.' During the boot sequence, the computer checks itself to be sure all is well, activates the necessary hardware components and loads the appropriate operational software then loads the operating system so that a user can interact with the machine.Īlternatively called boot options or boot order, the boot sequence defines which devices a computer should check for the operating system's boot files and startup. However, if you want the computer to boot up from a DVD or USB, you’ll need to change your computer’s boot order to list these first.

Normally when you start up your computer, it will automatically start by reading the computer’s internal hard drive.

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