Folders missing when swapping drives about and now has different label

I have about 6 HDDs, I was swapping some about from one PC to another, for some odd reason the drives would not always show up. So I had to swap them between different SATA sockets or USB docks to see them. All of a sudden I get a 10 second message that says "scanning and fixing Drive E: Movies" or words to a similar effect. This was during the windows boot up. It was very quick and I only noticed the message out of the corner of my eye. Oddly I now find a drive that was called Encoding has now changed to Movies, which is the name of another of my drives. The most annoying thing is 2 major folders are missing + some files in the root. I am so annoyed as those 2 folders were really important. Oh and yes, I know, they can't have been that important as you didn't back them up, but hearing that right now will just make me scream. I have learnt my lesson. One thing that also happened (before I noticed problem) is when I was changing drive E to F in Disk Management nothing would happen. So either that, or the boot up scan message is what made this happen, I can't pin point the exact thing as I just assumed I was looking at the correct Movies drive until I viewed the contents, as I was going by label name for a while.

I installed a undelete program but that has not found any files with the names that are missing. I am hoping it is just a "mapping" issue or index or something and that they are there somewhere just hidden. In my 20+ years of using PCs I have never had a HDD label change drives, and never had just some folders vanish. My other drive, the original Movies, seems fine and still has that label. But thee Encoding label drive is now Movies with the files missing.

Any ideas guys ? I am really lost here. Thanks for any help in advance. I am kicking myself for not backing up, believe me.

Solved it myself, just to help others, it seems CHKDSK did automatically delete my files, this happened upon windows loading. I found a CHKDSK log file and saw everything it deleted. I download a free trial of recovery software, and it found everything, I had to pay to recover but I am just pleased I did. I have now put all my recovered files on my backedup RAID, I am not making that mistake again. Just letting others know these files can probably be recovered for you too, they are still on the disk, you just have to use software to scan for the hidden files. If I took longer I probably could have found free software, but I was too desperate, and I used a 60% off voucher anyway. Oddly the first software I tried only found half of the files, so I am pleased I tried others. I am not saying the software name so I don't get blamed for spamming, but remember to try a few if the first one doesn't work, just search for CHKDSK file recovery software, there are loads out there.