I bought a Seagate Go Flex 3TB External HDD w/ USB 3.0 interface, STAC3000101. I tried to shrink the drive and ended up with an unallocated sector with no options available. I cannot create or delete New Simple Volume. All I could see is just the properties which indicated the drive as 750G. The partition with 2TB seems fine. I could shrink the 2TB to 2 split 1TB partitions but the 750G was not even accessible. I tried deleting the total volume and re-partitioning it again. I still can't see the 750G. I could only see 2TB. It seems that I could only access 2TB and not the rest. What is going on here? Is this a manufacturing disk error or is something to do with the partition restrictions or set limit storage capacity of Windows Vista? How can I get back my missing 750G bytes free space? Is there any other Windows or operating systems which can solve this problem?