External USB Drive unmountable after deleting the Shared Folder and unplugging (ExFAT)

Dear Forum,

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!!

Thank you.

pi@raspberrypi:~ $ exfatfsck -n /dev/sdd2
exfatfsck 1.3.0
Checking file system on /dev/sdd2.
ERROR: failed to open '/dev/sdd2' in read-only mode: Permission denied.
File system checking stopped. ERRORS FOUND: 1, FIXED: 0.

It seems to be locked.

A second thought: the partition is not accessible, so it is not like it actually is read-only. For the moment, it is drive-label-read-only.

Should I run the invasive variation of exfatfsck? I am always a bit catious.

sudo exfatfsck -n /dev/sdd2
exfatfsck 1.3.0
Checking file system on /dev/sdd2.
ERROR: unknown entry type 0x84.
File system checking stopped. ERRORS FOUND: 1, FIXED: 0.

BTW. from the OMV Prompt when trying to mount, overwhelms me with the same kind of error. The 0x84 entry type, I could copy it in here but it is extremely long and perhaps not useful (repetition).

OK. Thank you regardless.

"The 0x84 file system ID is commonly used for hibernation partitions."

There used to be one that I knew of.

Now there is like 30mb followed by almost 4tb. But the 6tb also has it so I guess it is some Seagate thing or a Windows thing.

Zitat von Soma

What is the output of sudo fdisk -l /dev/sdd

With ext4, it's easy to re-do the partition without damaging the FS but I don't know if it's OK for other FS.

Been doing it with SD cards to expand the root partition and I haven't lost any files but, again not sure if it's OK for Windows FS (maybe search the Web about it):

Raspbian Btrfs root filesystem guide (2017-06) - HackMD

The above topic is what I use. The main concern is to know the exact start and end sector of the partition.

If you find that it also works with exFAT, try it AT YOUR OWN RISK. <minor disclaimer>

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This makes me anxious. Will this work with exfat filesystem?

Thank you,

Now, I will try it. I will write here my results. So far, the windows tool is also frozen but I asked at the forum there as well.

Meanwhile, if anyone of you knows some more ideas, that would be incredible!