In the interest of not mucking things up, I'm writing here first. I've done a fair amt of recovery but not yet successfully when the partition table (MBR vs GUID) is unknown and and I am second on the scene.
I plugged the 1.5TB SATA drive into another computer's USB via a USB device.
A message popped up asking for Windows to 'initialize' as MBR or GUID (if over 2 TB).
I cancelled and went to computer > manage > disk management, and saw the space as not initialized.
I installed Recuva recovery software and of 'course it isn't seeing anything yet.
What is my best next step?