How can I get Windows 10 to recognise the remaining part of a 4TB disk?

I've installed a new 4TB magnetic HDD to my Windows 10 machine. It has 2 partitions of roughly 2TB each. The drive didn't just appear, but I found that using the Windows Computer Management tool I could format the first partition and assign it as E: in Windows.

However, there doesn't seem to be a way to assign the remaining 2TB to a drive or even to format it. I've attached a screenshot of what's showing in the Windows Computer Management tool.

How can I get Windows 10 to recognise the remaining part of the disk? Thanks!

Update: Following this guide, I was able to combine both partitions into a single 4TB partition, however I had been hoping to have 2 drive letters with roughly 2TB assigned to each. I'm still not sure if I can do that.
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Terry WoodsIT GuruAsked:
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Cliff GaliherCommented:
A lot will depend on your computer.  If the computer supports UEFI then you'll need to wipe the disk, convert it to GPT, then reinstall. Only UEFI computers can use GPT disks as boot devices.

If your computer is stuck with a legacy Bios then you'll need to install a utility provided by the drive manufacturer that exposes the remaining space as a second "virtual" MBR disk.
RartemassLife CoachCommented:
Having it show as unallocated is a good sign.
How did you partition it?
Do you need it partitioned?

A simple way is to simply extend the E drive to use the rest of the space instead of having partitions.

There are more robust programs that allow far more options with partitioning than Windows allows. Tools like EaseUS, GParted, MiniTool and Paragon would suit. Most are free for the basics that you are seeking.
Terry WoodsIT GuruAuthor Commented:
@Cliff, you posted just as I updated the question! I won't be booting off the new disk, and have now managed to convert it to a single GPT partition, but I had been hoping to have 2 partitions. Do you know how I can do that?
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Terry WoodsIT GuruAuthor Commented:
@Rartemass, I remember reading about GParted before... would that allow me to create 2 partitions and assign a drive letter to each?
Cliff GaliherCommented:
Disks are MBR or GPT, not partitions. Once the disk is converted to GPT, you should be able to create an additional volume.

Simple right clocks should bring up new options if the disk is indeed GPT.

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Terry WoodsIT GuruAuthor Commented:
Thanks Cliff. You're correct, I was able to do what I needed with the right click context menu.

In case it's of any use to anyone else, this page was useful in helping me understand that I wanted a "Simple Volume" rather than Spanned or Striped.

I now have 2 new drive letters... :-)
Terry WoodsIT GuruAuthor Commented:
Thanks very much!
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