Accidently flashed Windows 10 ISO to hard drive instead of USB

[sninjax]

I made the foolish mistake of flashing Windows 10 to my 2 TB hard drive instead of my 16 GB USB using the Microsoft media creation tool. After looking around for a free solution I stumbled across TestDisk, but am very clueless about how to use it. I am unsure what file system the hard drive was before it was formatted, but I would assume either fat32 or NTFS. I couldn't make sense of much of the documentation or responses to similar issues on Google. My level of competence in this field is cleaning a drive using Diskpart, so any advice would have to be pretty step by step

Any help would be appreciated !

[recuperation]

Your harddrive did not have just one partition.

Read here about Testdisk:
https://www.cgsecurity.org/wiki/TestDisk

You can cross-read the forum as well.

[sninjax]

Thanks for your reply. Given that the hard drive was in multiple partitions like you said, would that make recovery not feasible/outside the scope of TestDisk? I've tried looking through the wiki you mentioned previously, but I'm unsure if I would be able to use the methods for undeleting files to restore my previous files (unless I'm missing something pretty obvious). If you could point me in the direction of one of the more relevant tutorials I'd really appreciate it. Thanks again for your reply

[recuperation]

https://www.cgsecurity.org/wiki/TestDisk_Step_By_Step