I see no one else has jumped on this
It is a scary one because I can't be sure that a clear and reset won't destroy the data or if it really was part of a RAID array before maybe only partial data is on the drive.
Here are some things that I can suggest you try.
Is the drive plugged into a RAID socket on the motherboard (the BIOS expects whatever is plugged into that one to be part of a RAID array)? Can you try a different socket?
Can you connect the drive to another machine?
If you can get it in a machine where the BIOS recognizes the drive as ONLINE instead of OFFLINE then maybe you'll see the data on it.
You could try booting into Linux and see if the disk is visible but since your BIOS doesn't seem to like the drive I'm not sure that will work.
I use Parted Magic a lot lately (there are several that I switch between so let me know if this one does not suit you).
Burn a CD with it and boot from the CD
Click the mounting tool which is the second icon from the left on the bottom of the desktop.
See if you can mount the drive and then open the File Manager on the desktop
Go to /media folder in root and see if the drive you mounted is there.
If it is you should be able to navigate it and copy the data to other drives (once they are mounted also).
Let me know if you need more details about anything.