As other on the thread have zero'ing in on, it is likely an issue with whatever USB/SATA adapter your using. This was a known limitation of early chipsets, and I recall the marketing shift to 'supports larger then 2TB!'.
Pretty sure that's it. As I look around at what's available, even finding one now that supports 10TB is not so easy, many top out at 8.
Since I can't yet put the drive in the chassis I have this enclosure on order which will be useful later anyway.
Thanks for the feedback.
Anyone want my existing enclosure? I can bring it to the next meeting. You all know its limitations, but can't beat the price,