Unable to initialize 8TB in RAID; system does not recognize

I followed the instructions for RAID conversion using the Firewire
connection (the fastest for this 2009 build).
The result was the message: “The disk you inserted was not readable by this
computer.”
(Note: when I powered up the drive, the light flashed red briefly, then
went white. Don’t know if this is relevant or not.)
I then used the USB 3.0 connector and hooked it up to my Macbook, which has
a 3.0 port. Again, I received the message, “The disk you inserted was not
readable by this computer.”

What is frustrating was that when I plugged the drive in, it was perfectly
fine and I started to back up my data. I stopped when I realized it was in
RAID 0 and not RAID 1, which is what I bought this to do. So I attempted to
reformat the drive. It erased everything as expected. It just didn’t make
it to the next step.

What now? And thanks for your help thus far.

Brought to you by www.bethshibata.com http://http//:www.bethshibata.com

“The clearest way into the universe is through a forest wilderness.” John
Muir