I have searched the web far and beyond and I could not get an answer to my problem, so I decided to post it here.
1. I have an improvised OMV NAS with 5 drives (750gb NTFS, 2tb NTFS, 4tgb exFAT, 6tb NTFS, 6tb NTFS - the only one empty) and I used it for a while.
2. However, my goal is to turn the last drive into a Parity drive (automatic backup, I used to do all by hand so far). In order to do that, I planned on unplugging the full 4gb and the empty 6gb and moving the files through windows (faster than on the network), reformating the 4gb drive into ntfs, moving the files back to the 4gb, and replugging both of the drives.
3. Now, I removed the SMB sharing, the shared folders, and disconnected the both drives. Then, I connected them to windows... and it does not recognize the 4gb drive - it prompts me to format the drive (which I did not do of course). The 6gb is fine. Then, after plugging both of them to NAS - the big one works fine again, the small one doesn't even mount... although it does have a correct drive label and OMV recognizes the exfat filesystem.
I cannot see my files anymore and I need help. I have a partial backup but I believe they are all there still somewhere.... I hope there is some easy fix to this problem.
Thank you for all the help!!