I have a few machines here with front-mounted SATA bays. I safely unmounted a hard disk (NTFS) with valuable contents, and then mounted it in another machine. When I did so, that machine showed it as having the volume label of the drive that had been in it before. When I checked the contents, the most important folders were missing.
After checking on another machine, I ran chkdsk and it ran off an entire list of errors and "fixed" them. The drive now appears as except for one folder.
TestDisk tells me the following:

I've left it doing a Deep Scan overnight in the hope that I'm going to wake up to recoverable data tomorrow. Having said that, can any experts on here offer any more advice?
Many thanks, and fingers crossed.