4TB External HDD formatted only 2TB allocated

I bought a Hitachi Touro Desk Pro to back up my new build and Windows Backup & Restore came back with an error (0x8078002a). After searching the internet for a solution, the most popular one was to format the drive and try again. I did this and it still didn't work, so I formatted it through Disk Management, and that left me with a 2TB partition and a 1.6TB partition. I can only allocate the 2TB partition, but cannot extend it into the 1.6TB. When they are both unallocated, I cannot allocate the 1.6TB. I've tried DiskPart, but that leaves me with the same results.
I haven't been able to backup my computer yet, and I'm getting really antsy about it because I know of all the things that can go wrong. Any ideas please?

 

What OS are you using?

The issue is it likely being 4K sector drive and I am not sure if formatting will change the physical sectors.

Here are some MS links about the 4K sectors:

http://msdn.microsoft.com/en-us/library/windows/desktop/hh848035(v=vs.85).aspx

http://support.microsoft.com/kb/2510009

As for formatting the other partition you may need a utility like the following

http://majorgeeks.com/Aomei_Partition_Assistant_d6463.html

 

I'm using Windows 7

 

Yep, been through this. You have to use GPT.

 

You are amazing! Thank you so much

 

I'm still getting the 0x8078002a I/O error when backing up

 

At this point from some internet research the only fix appears to be to format the hard drive using default options in Windows 7.

Make sure you format the whole drive as one partition and then if you need to split it into other partitions you can delete & reformat it afterwards with your partition structure.

 

I tried that, and that's what got me into the original mess of having two partitions, one of which I couldn't format. I can't seem to find anything online, and the Hitachi tech support guys aren't being of much help either

 

This is interesting, as if you delete all partitions from the drive and create one new one, Windows shouldn't create two.

Please download the program below and burn it to a CD. Then boot the system from it, and this will allow you to format the drive outside of Windows to see where the problem lies:

http://gparted.sourceforge.net/

 

I've gotten it to create just the one partition now (I was creating an MBR instead of GPT), I just can't back things up on to it. I get the error code 0x8078002a

 

I have tried that update - it was one of the first things I tried.
But that backup program worked, thanks