Windows 10 Partition Help on 1TB HDD

Hi,
I've got a 1tb hdd that I solely use for storing movies/video files. Atm it's divided into two partitions, one of them is 390gb and the other is 540gb, but the 390gb partition is full. I'd like to merge these two partitions into one larger partition without losing my data, but I'm not sure the best way to do this. Is there some reliable software I can use? Google came up with EaseUS but I've never heard of it and I'm not sure if it's reliable or what. I also have a 101mb and 451mb slot saying "Unallocated" in disk management which I'd like to add to the partition. However, when I try to extend the 390gb partition using disk managament I get an error saying:The selected GPT formatted disk contains a partition which is not of type ‘PARTITION_BASIC_DATA_GUID’, and is both preceeded and followed by a partition of type ‘PARTITION_BASIC_DATA_GUID’.

I've attached a screenshot of my disk management. Any help is appreciated. Thank you!

Your 390 GB partition is only 9% used! How is that considered full?

Anyway, I like MiniTool Partition Wizard, it has never failed at anything I wanted to do:
Best Free Partition Manager for Windows | MiniTool Partition Free

Thanks for all your help, I've used Partition Wizard and managed to clean it up to this by labelling D as inactive and merging/extending into one big partition:


One more thing though: I have two 455MB partitions in Disk 1, and both of them are using some space. I feel like I should only have one of them, and the other isn't meant to be there/is a duplicate, so I should be able to delete that and merge the unallocated space into C. So how do I find out which one to delete?

And @NavyLCDR the partition had 9% free space not 9% used :P

Bree said:

...with a probability of 1 in 3 (there are two other recovery partitions on disk 0).

In a Command Prompt (Admin) type reagentc /info to find out which on is in use.

Edit:



They are both shown as recovery partitions, the reagentc command above will tell you which one is in use (unless, of course the active one was the one you removed from the other disk).

I put reagent /info in elevated CMD but get this error: C:\WINDOWS\system32>reagent /info'reagent' is not recognized as an internal or external command,operable program or batch file.

Any idea? Thanks for the help as always

Lol nvm didn't see the C

Ignoring the previous post, this is what CMD has come up with:

Windows Recovery Environment (Windows RE) and system reset configurationInformation: Windows RE status: Disabled Windows RE location: Boot Configuration Data (BCD) identifier: 556da356-d978-11e7-82e9-f0896f83fa5c Recovery image location: Recovery image index: 0 Custom image location: Custom image index: 0REAGENTC.EXE: Operation Successful.

Not sure what this means. Cheers