Help! 815gb lost after canceling set new location

[Zavego]

I was having an issue where qbittorrent said the cylindrical error for my hard drive.
I was 85% into an 815gb download and suddenly it couldn't compete a recheck (I did it after losing all active seeds). Was taking a long time and would then give that error mentioned above.

So I tried to move files to a new folder/drive using the right click and choosing location but that also took a long time just to do a few files so I tried to cancel the new location by switching it back to the old location.
Was still stuck on 1.2% so I exit and reopened but now the original files are all gone.

Are they stored anywhere whilst it tries to move them? as the free space on my C drive has not increased as you'd expect it too if there suddenly wasn't a 800gb torrent in the folder anymore.

Now the torrent is starting again from 0 and I don't want another 7 days of leaving my PC on 24/ like I have done for the last week to get that far.

[Zavego]

So nobody knows?
I find it hard to believe it could be stupid enough to actually remove the physical files and not keep them safely stored in a back up file or link somewhere while it carries out its process.

[Peter]

Ugh hard drive failure is the worst.

- You should back up the most important bits of that drive ASAP.
- Check with CrystalDiskInfo, see if it really is dying/dead.
- You can recover lost bits, lost space and so on using "chkdsk". If you right click your partition, go Properties, then Tools (tab) on top and Check for errors. This CANNOT fix your hard drive physically. It only tries to fix filesystem errors. Ie.: your lost disk space might be back, but your drive will still be dying.