I just built a ASRock E3c226D2I with 16GB of ecc ram and 4x WD 4TB. I used Imagewriter to burn the 9.3 ISO to a USB Adata 16GB USB 3.0 and put another identical USB into the MB slot. After booting up I eventually get error 19. I try to boot the 9.3 USB on my windows computer to install onto the other 16 GB USB but got the same error. I decided to try my Sandisk USB 2.0 2GB stick which had 9.2.1.9 on it and the ASRock boots up fine. Is this a problem with Adata USB sticks or something wrong with 9.3?