I tried 2 different usb drives, both with the arch iso (same that i used to install the currently running OS, downloaded yesterday). When i press the power button greeted by the grub bootloader in about 1s. Also, prior to the arch installation (came with w7 installed) the BIOS screen would stay for about 2seconds and then proceed to boot - this doesn't happen anymore. The boot priority is set to usb drive first, the boot selection screen (hammering f10 during boot) doesn't give me any other option than to boot from the normal SSD. I tried to boot with the same USB drive that i used to install arch just yesterday, the live media does not boot - the drive doesn't even blink. If enter the boot selection, the bootable USB drive won't show up. I just happend to notice that BIOS is not checking for USB drives anymore, it just somehow skips that part. Everything went fine and the system is running flawlessly.

I'm fairly new to the arch (and linux) scene and just setup my Samsung 530U3B with a brand new installation of arch. SOLVED: In BIOS under 'Advanced' disable 'Fast BIOS Mode'.

Bootable usb not detected in bios