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So, testdisk gave me error again when writing the partition to the disk, but I copied all of my data to another disk.
Since I copied 40GB of files, is there a way to check if some of those files are corrupted before formatting my HDD?

I rebooted the pc.
Now I can see some partitions, but the bigger one (the one with the data) is RAW.
Currently I am running another search with Testdisk. diskmgmt2.PNG

EDIT
The quick search found 3 partition, none of them contains my data.
Actually running the deep search.
PS: when I opened ...

Thank you, I feel so stupid right now.
I choose the first (It's not essential, it's Dell utility) and the third (this one has my data). I choose write, but now I've got this error:

Hello,
I need your help to undelete a partition on a dynamic disk.
This is what happened: at work I have a 250GB SSD that I use for the OS and a 500GB HDD that I use to keep all of my backups.
In the morning I copied all of my files to the HDD because I wanted to reinstall Windows 10 on the SSD ...