Missing Data still taking up space on hardrive. Help Recover

Okay, there is a lot to tell because I've already been troubleshooting this problem. If you are going to offer help, please read in full so you know what I've already tried. Thank you.

Alright, about a week ago I was deleting individual unneeded files from and external hardrive, as well as moving some files around though still upon that hardrive. At some point about 2TB of data disappeared from within a folder on the external hardrive. I have not written any new data onto that hardrive, and the memory of that data is still taking up space.

Now I don't believe that I accidently deleted it (though I won't rule it out) because the folder all of those files (video files mostly) were in was still there. And if I was going to accidently delete ALL those files, I'd have done it by accidently deleting the folder those files were in, no way in hell I'd have made the mistake of manually selecting all those files and deleting them.

At any rate, the missing 2TB of data is still taking up space on the external hard drive. As I did not intent to delete it (if it was even deleted), recovering it is what I'd prefer to do. I have downloaded a variety of recovery software such as disk drill, RecoverIT, and Recuva. And while each time it the recovery tools show a lot of files that I'd long since deleted both recently, and long ago, not a trace of ANY of the files within the 2TB folder of missing files in question ever appeared in any of the data recovery searches, not even with a deep scan (which took 74 hours to search the 8TB hardrive).

So, I am convinced that the files were not actually deleted. Even if they had been, they haven't been over written and I imagine that I'd have seen them by now. Also the data still is showing as being used on the drive.

He's the problem. I first checked to see if I had accidently hidden the files, but after using File Explorer and selecting to view all hidden files and folders, I found nothing.

Something else that is curious, inside the external hardrive (8TB Western Digital Red), the complete file folders only add up to about 4.5 TB's of data. However when I search the properties of the external hardrive itself, it shows upwards of 6.5 TB's of used space.

So I believe that the data is still there, even though I can not see it. If it was accidentally moved into a different folder, the folders inside the external drive would add up to the correct amount of data, though it does not. I've also searched multiple files that had been in the original folder, and search results yelled no results.

Most post I've seen about missing data has always been resolved from either data recovery software at least showing where the data had been deleted, or people learning finding that the missing content was inside a hidden folder. Neither of these seem to be the case in my particular situation. I've reached the limit on what I know, and I would greatly appreciate any help or advice on what I could try next that I've not already tried. I apologize if this was a lot to read but I wanted to include as much information on my situation as possible.

Again, the external hardrive is a 8TB Western Digital Red. The computer I am using is a M14 Alienware laptop with windows 10 installed.

The external hardrive