My apologies for not being able to run a test right now. I believe I shipped you the card I had here for a test card, the only one left at the time. Now we are out of more for another week at the warehouse and another few days after that for me to get one here to restest various configurations.
At this point I don't remember which operating systems I tested with. Winders and one or two different Mac OSes. I just don't recall now which ones. And unless I test it and prove otherwise, I don't typically believe manufacturer claims. I'll see what I can find as soon as I can get hands on another card. I even have the operating system, now High Sierra, on a 1TB Crucial MX300 SSD.
As an aside, was thinking about testing booting that SSD in the Sonnet Tempo SSD. See if it makes any difference in performance.
Sorry about the problems you're having brother marrand. I'll see if I can figure out why you aren't bootable. Another note is that the reason the Lycom card is supposed to be bootable is it uses built into the operating system AHCI drivers. This also means there are no drivers that we can update or install. These are the same drivers the internal USB bus uses.
Rick
molṑn labe'
"I am a mortal enemy to arbitrary government and unlimited power. I am naturally very jealous for the rights and liberties of my country, and the least encroachment of those invaluable privileges is apt to make my blood boil."
--Ben Franklin