BIOS (Basic Input Output Subsystem) is a programmable chip that controls how information is passed to various devices in the computer system.

BIOS settings allow you to run a boot sequence from a floppy drive, a hard drive, a CD-ROM drive or an external device. You may configure the order that your computer searches these physical devices for the boot sequence.

The first device in the order list has the first boot priority. For example, to boot from a CD-ROM drive instead of a hard drive, place the CD-ROM drive ahead of the hard drive in priority.

Before you set boot priority for a USB device, plug the device into a USB port.

Specify the boot sequence

Entering in BIOS

Start the computer, when you see the manufacturer’s logo press the designated button to entering the BIOS. The BIOS Entering key is predefine by manufacturer. Normally setups keys are F2, F10, F12, ESC and Del. The key will be also displayed on the screen when your system start’s with the manufacturer’s logo appears if didn’t then you can use the given ones.

Navigate To BIOS Setup

After pressing the correct key command, you will enter in the BIOS Setup. The BIOS setup utility page appears.

Finding the Boot Settings

Now you’ll see lots of setting and information about your system. In order to change boot sequence you’ll have to find boot setting first. Here are two example of BIOS setting to show you how to find it.

Use the arrow keys to select the BOOT tab. System devices appear in order of priority.

Change the boot order

To give a CD or DVD drive boot sequence priority over the hard drive, move it to the first position on the list.

To give a USB device boot sequence priority over the hard drive, do the following:

  • Move the hard drive device to the top of the boot sequence list.
  • Expand the hard drive device to display all hard drives.
  • Move the USB device to the top of the list of hard drives.
Save and exit the BIOS setup utility.
The computer will restart with the changed settings.
  • NOTE: All BIOS setup utilities are a little different so yours may look like this or it may look completely different.
  • NOTE: Most BIOS allow you to move through menus by using the arrow keys, or + and – keys for navigation.

Boot Priority Options

Some computer manufacturers allow you to select the device that contains the boot sequence from a special device selection menu. The example below uses a Dell system board.

To set boot priority using a device selection menu:

  1. When the computer starts to boot up, after the manufacturer’s ID screen, press F12 several times. The device selection menu appears.
  2. Use the up and down arrows to select CD-ROM or an USB Flash Drive.
  3. To boot from the selected device, press ENTER.

Note: Using an incorrect BIOS setting can cause a system malfunction. Please follow the BIOS guide provided with your computer motherboard. If you read these instructions and you are not sure how to change a setting, it is better to leave it as the default setting.