If I am not mistaken, the GRAID enclosure is a multiple drive enclosure with a built in RAID0 function. You cannot pull the drives and attach them to a regular SATA connection, like inside the MacPro, and have the volume mount. The enclosure/bridge created the RAID, without the bridge the RAID won't function or be mountable.
Not what I wanted to read
Ricks, I think you're right about the configuration.
I got a quote on having the data retrieved. The amount they are asking for is astronomical .
I had some one else also suggest trying a different power supply unit as these sometime limit the power hence the drive not being able to fully spin up.
I can hear mine spinning. But then spinning back down again.
Going to source a PSU this weekend and keep my fingers crossed.
A lesson well learned I think. Have a double back up.