On boot/reboot I have to enter disk management to assign a drive letter to my raid 0 setup. It keeps forgetting on reboot and I have to reassign. It worked previous to windows 8.1 update. I have don't a complete format and reinstall along with updating my bios to the latest release.
Z87 Mpower max
4770k (stock)
Samsung 840 pro 256 with win 8.1
2x1tb wd black in raid 0