From your description of your drives, I was assuming you had put the box together yourself and had the info that came with the drives and knew how they were hooked up.
I think you may be able to tell in Windows with the
BelArc advisor utility and see what the drives are.
I can't think of a command to see what they are in Linux, but there must be a way. Perhaps someone else who knows more than I do about it.
Perhaps of you booted into one Linux and post the output of:
mount
then do the same for the other install, that might give some info.
Also, the output of:
fdisk -l
You may have to be root for the second command.