Boot Menu

What is the boot menu and how to access it on your computer?

https://www.computerhope.com/jargon/b/boot_menu.htm

• Acer Aspire R - Jim's computer - USB HDD should be the choice of boot device for USB. [1]. Video [2]
  • First hit F2 to enable boot menu settings. Also need to enable legacy mode. Then under boot order in another tab select USB-HDD.