https://www.truenas.com/community/threads/asrock-z97-extreme4-unable-to-boot-from-usb-solved.69165/
AsRock Z97 Extreme4 unable to boot from USB (SOLVED) | TrueNAS Community
Figured I'd post this here in case it could help someone else. I'd been running FreeNAS 9.x for over a year just fine. I just tried to update it it to...
asrock z97 extreme4to bootunable