I GIVE, after months trying to make this work to gain a couple seconds in real life apps is not worth it. For years I had 3 different OS on different hard drives in same computer with no problems. Han one for wife, me, and work . Never had a issue like this 990 pro getting blue screens daily and constant disk checking. I can no longer waste my life trying to make this work, for some reason when I boot to the other drives windows manger changes stuff on my 990 drive. I see no way of stopping this, guess it back to using sata ssd drives. Not sure why windows doesn't mess with them, guess the 990 would be good if only drive in a computer. I can boot to the 990 a dozen times without problems, but as soon as I boot to one of the other drives the problems begin. For the life of me I just don't understand why. Tomorrow I will pull the video card to get the 990 out and put on a shelf for another build some day.