In the screenshot the general information of the stick:
In the bios I set the multi flash reader before the HD and tried to boot directly from the stick on the boot override options, no cigar. I know the boot order and the boot override works because I tested with a bootable DVD and it was prioritized by the order and skipped when I used the boot override. I wrote the ISO on the usb stick using "dd if=CentOS-6.5-x86_64-bin-DVD1.iso of=/dev/sdb" and before that using ubuntu's image burning tool. On both methods the information of the device was the same on the disks utility.