I have a WD 500GB drive. I installed W7 - cloned from a 2TB drive that has 4 partitions (100MB, 78.03GB, 363.20GB, 1.39TB(logical)) with the first 3 partitions. I then extended the last partition with disk manager to 387.63 which was all the unallocated space left. So the 500GB drive = 100MB, 78.03GB, 387.63GB. When I originally installed W7 on the 2TB drive I set the system partition to = 80GB. After W7 created the partition I had 100MB and 78.03GB. I don't remember what # I used to get 363.20 but that isn't important. The goal now is to make the three partitions = on both drives. They r all primary partitions. When I look at 500GB in disk manager a 2MB unallocated piece shows at the end that I can't do anything with. There is also a 1MB piece on my 2TB drive between the last primary partition and the logical partition. What causes this? 0.1+78.03+387.63 = 465.76GB, which is the std windows size for a 500GB drive, right? Is there a way to partition the drive to get rid of it? I am guessing if the drives were formatted to 1k units it would use them all up. true? I think I just answered my own question......... since it is formatted in 4096 units it can't include that last piece in the previous partition because it is only a partial unit. Right?