Got it, thanks for the update. This helps.
I believe this is not dupeGuru and not ZimaOS, it’s an exFAT limitation.
exFAT does not support Linux file permissions (no chmod, no ownership per file). Everything is controlled at mount time. So even if the container runs as root, deletes can fail depending on how the disk is mounted.
Why it works on other disks:
- ext4 / btrfs support proper Linux permissions
- exFAT does not
What I suggest:
- Reformat the disk to ext4 if possible (best long-term fix on ZimaOS)
- Or remount exFAT with explicit ownership (uid/gid) so containers can write
In short:
dupeGuru is fine, ZimaOS is fine, but exFAT is the weak link here. On Linux NAS systems, exFAT is best treated as read-mostly or temporary storage.
I believe switching that disk to ext4 will permanently solve this.