In my efforts to fix my previous problem, I resorted to a fresh install of Windows 10. I have two drives - one is an SSD on which I installed only Windows-related files, and the other is a 500gb traditional hard drive on which everything else was installed. It was during the install of Windows, through the Windows Media Creation Tool method (created installation media onto USB, booted from that USB) that I got to the step where I was to format the disk(s) for a fresh install. Forgetting that both the SSD and HDD were both still installed, I'm 99% sure that I removed a partition on the HDD by mistake.
Now, the HDD shows up as a Disk Drive in Device Manager, but it doesn't show up in File Manager. It shows up as Disk 1 in Disk Management, but as 465gb of unallocated space and with no option to assign a drive letter - the only options in Disk Management are Convert to GPT, Convert to Dynamic Disk, and to create a New Simple Volume.
The only things I've done so far as scan the drive for lost partitions and recoverable data, but I haven't actually recovered any of the data or tried to recover the partitions yet. And since its not mounted or accessible I haven't overwritten anything (I think), and I haven't formatted or done any converting.
I'm able to see (probably) all the files on the HDD through freeware/trialware tools like Easeus, but I don't have enough space on my SSD to recover them all to. Ideally, I could restore the partition and just mount it back as a normal drive. Is that possible?
At the moment, I'm running a deep analysis with TestDisk but I'm a bit afraid to do anything more since I'm not 100% comfortable with cmd prompt stuff. TIA.