Windows 10: How can I access my 4TB SSD so I can use it for data storage?

So I recently built a PC with three hard drives. An old 1tb HDD from my old computer; a 1TB SSD; and a 4TB SSD. I think I made I mistake when I was setting up my computer after installing everything and now I can't seem to access the 4TB SSD under "devices and drives", though it is visible and working properly in 'disk management' where it has a 1.05 GB healthy EFI system partition and a 3725 GB healthy primary partition. I would like to add a drive letter to the primary partition but it doesn't seem to be an option. Can anyone help me figure out what I'm sure is a pretty simple fix?

:)

 

Is this amount of Data writen normal for a SSD?

I don't use SSD, since I heard that SSD has a very limited time for writes. And every time, you write something, it erases whole piece and write again together with the new to storage. Tip also suggests us to leave 1/4 SSD space for temporary storage. Or trouble will come.
Tips also recommend us to leave SSD for OS, and HDD for programs and data.
If your data is OS data, then there is nothing to do.

 

Ugrading my 1TB MBR HDD to a 4TB GPT SSD

You should do steps as follows

1) clone 1TB hdd to SSD

2) run mbr2gpt utility to convert ssd to uefi

Convert Windows 10 from Legacy BIOS to UEFI without Data Loss

3) extend 1tb partition on SSD to 4TB using tool like Easeus Partition Master (free version is ok).

Step 2 is the critical step.

 

4TB hdd for Storage?

I always put data integrity above all else. There is a reason why both my gateway/NAS and my tower both have RAID-5 arrays for storage. When you use storage for something a little more important like documents and family pictures, losing your data isn't a viable option so a single drive shouldn't even be considered IMHO and an external and/or segregated backup is a must.

For just anime, fine, go ahead and grab yourself a 4TB drive, but you don't need a red or a SE/RE(3/4). You just need a storage drive, so another green would be fine unless you're planning on going the NAS or RAID route.