While trying to reformat a Samsung NP530 Ultrabook I found that it would not boot from any USB devices despite changing the boot order and using F10 to enter the boot device selection menu. The issue turned out to be that "Fast BIOS Mode" was set to enabled which by design bypasses detection of USB devices to speed up the boot process This means not only will it not boot from USB automatically but it won't even show up in the manual boot selection menu. Changing Fast BIOS Mode to disabled allowed me to select USB devices from the boot menu and to be used properly depending on the boot order.
Here is a summary of Fast BIOS mode from Samsung
- Fast BIOS Mode is technology to reduce the boot up time by skipping the USB check in the POST stage. * DOS mode booting is not supported. (Basic ODD, USB memory devices, etc.)
- The factory default setting is [Disable]. When the purchase date is registered, the setting is automatically changed to [Enable]. Once the setting is changed to [Enable], the default setting in the CMOS is changed to [Enable].