If you'e having problems recognising a boot device on a Samsung NC110 Notebook (Windows 7) try the following:
During boot up, Press F10 to enter boot device menu, (or you can enter bios by clicking on F2 during boot up)
Click on advanced settings
find "fast bios mode", this is usually set on enabled so you will need to disable this,
Save and exit (F10)
Re-boot machine, press F10 to get into boot device menu, select your USB device or drive and hit enter.
If USB device or drive is not recognised try again but ensure USB device/drive is plugged into the USB port.