Not 100% sure about the harddrive that corrupted location. I will try find it but won't get that opportunity for another couple of months. Was an external hard drive with its own plug in power supply with USB attached. Should have really put it back together but I just threw it into a box. It looked like a broken completely trashed piece of junk so fair chance someone binned it during a move without my knowledge.
As I wrote earlier, hard drive recovery remains your first option.
If I boot the Seagate drive again & I've "hidden" the files someone where ridiculous what command would unhide the file & find the wallet.dat. I just tried searching for that & a text file. Neither showed up in a quick search. Still got that drive here with me. Haven't tried finding hidden files yet but it's definitely a different filing system which threw me off straight away.
You need to use this hard drive for reading only and make a full copy of it (dump).
The best way to do this is with dd Linux.
In the future, you need to work only with the copy of the disk.
The dump may contain certain bytes that relate to private keys, including deleted data.