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How to assign unallocated space after clone

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I used ATIH 2014 to clone a 1Tb disk to a 3Tb disk (Win7, 64-bit). The cloned disk is 2TB and the extra 768GB is in an extended partition that I can see with Extended Partition Manager (see attached: extendedpartition.png).

What I can't figure out is how to assign the extended partition a drive letter or format it. It doesn't show in my list of disks under Windows Explorer.

I have tried "Add a disk" to format it as both GPT and MBR, but it still shows up as unallocated (see attached: unallocated.png).

Grateful for any instruction.

Regards.

Kevin

Attachment Size
extendedpartition.png 32.95 KB
unallocated.png 36.76 KB
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Figured it out.

While I did re-clone using MBR format instead of GPT on the new disk, I am not sure that was the fix.

I noticed after the re-cloning that the Add New Disk Wizard had a "Create New Partition" button at the top-left of the "Partition Creation" step which let me allocate the extended partition. The button might have been there before I did the re-clone and I just might not have noticed it, but it was definitely there after re-cloning as an MBR disk (same format as original disk).

If you have a 1TB disk, it is most likely an MBR disk (check under Windows disk management, choose in menu>view>top choose disk list).
If you use clone, it will automatically convert your 3TB disk to an MBR disk. But you need a GPT disk to be able to see the full benefit of the physical disk size.
So you should use a backup and restore approach and restore partitions only. If this is a system disk, let us know, because it is a bit more complicated.