

Save the change and then exit the BIOS Setup.Move USB device to the top of that hard drive list.Expand to show all hard drive device options.NOTE: If you cannot find USB or Removable Devices among the device options, your BIOS may list it under Hard Drive Devices. Move USB to be first in the boot sequence.All of the available system devices will be displayed in order of their boot priority. Using the arrow keys on your keyboard, select the BOOT tab.When you choose to enter BIOS Setup, the setup utility page will appear.(Depending on the company that created your version of BIOS, a menu may appear.) During the initial startup screen, press ESC, F1, F2, F8 or F10.

CREATE BOOTABLE USB ON MAC FOR LINUX SOFTWARE
The boot order tells the machine which devices to search for the software needed to launch the computer and the priority each device in that search. That’s because the BIOS settings include the boot sequence the machine follows when starting up.
CREATE BOOTABLE USB ON MAC FOR LINUX PC
Starting your PC using USB rescue media is not difficult, although it first requires an adjustment in the BIOS (Basic Input Output System). The Startup Manager only lists drives that include bootable content. NOTE: Have multiple USB devices connected to your Mac? Don’t worry. The machine will start to boot from the USB drive.

How you start that rescue media can vary depending on the operating system you are using, but there are a few general guidelines that can help get your machine started, regardless of the OS you prefer. As a result, booting from USB media is becoming the standard. And while users historically would pop a boot media disk into their DVD or CD drive, many computers no longer come with optical disk drives.
