In my experience, most of the 3.5" enclosure drives have been off the shelf. My last batch of HP ones were all WD Greens. I have seen a few WD 2.5" externals wi

In my experience, most of the 3.5" enclosure drives have been off the shelf. My last batch of HP ones were all WD Greens. I have seen a few WD 2.5" externals with proprietary connections :/