ACHI did not resolve the issue. I'm wondering if it is actually the enclosures - the one that has been working is the silver enclosure, while it *seems* to be the new black ones that are displaying the problem. Looking at the board inside each, the 2 black ones have the same board and part #, but the silver one is different. I am going to contact Newegg tomorrow to have them check one of the stock silver units for the part # on the board. I am also swapping out my existing drive in the silver enclosure with my new drive, just to cover all the bases. Will post when I have an update