Your wording is a bit confusing. You created a raid 0 array with 2 hard drives. What size are the drives? They are both the same size I hope, as otherwise you would be wasting space on the larger drive. You created a 50gig partition and installed windows on that partition. You also created a 100gig partition? And that 100gig partition is what you can't see? Did you go to disk management in windows and format the 100 gig partition?