have two 500GB Hitachi hard drives in stalled in my computer. The C; drive has windows xp installed on it. The second drive had windows 7 as of 4 days ago. Tried to start windows 7 and will not boot up. Reformatted the t; drive so now it is completely blank. Still have windows xp on my c: drive. The problem is the t:local drive will not appear in the device manager, but will show in My Computer.