Solutions
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Batter Pudding's post in [Solved] unmountable: wrong or no file system was marked as the answerOkay - fixed by clicking buttons here:
Storage Management | Unraid Docs
Storage Management | Unraid Docs
To assign devices to
Mounted Array in maintence mode. Selected the sick disk. Hit the scan buttons and just blindly followed. It zeroed a log and was then happy.
Phew. Nice that happened now while I still had backups on my desk.