If you have a Samsung notebook NP-N102S and you want to boot from USB bootable, follow these procedures:- Start your Notebook by pressing a Power button. Press F2 while your Notebook is starting to enter setup utility. Select Advanced tab using right arrow button Select Fast BIOS Mode in Advanced tab using downward arrow button Press Return/Enter key to get settings for Fast BIOS Mode. Change settings to Disabled. Press F10 to Save and Reset Select Yes and press Return/Enter key to a Press ESC key to Exit. Done.