Ellol

thank you so much, I'll try that as well

Thank you very much, @JorgeB , will follow the steps there and confirm back. Any hope for the parity drive perhaps or is it gone, awaiting to get formatted and reused?

Hi, sure, sorry, looks like I managed to delete the text 🤦 I was trying to convert my 10+ years old machine to a NAS but the hardware proves unreliable by now and one of my array HDDs ('Unmountable: wrong or no file system') and the sole parity drive (listed as unassigned disk device with the 'Mount' button available ) dropped off. Took a look at them under Win11, connected through an external HDD case, hoping to retrieve the data from the array drive (tried with Linux File Systems for Windows by Paragon Software as it's read-only for BTRFS so no harm expected). They're shown ok in the disk manager, passed the quick smart check via HDSentinel, also tried to mount them on a Mint VM and met the superblock read error and being less savvy at Linux commands than a trained monkey with a keyboard I just don't dare to follow the AI or to take any other action from this point. Not even sure which disk I'd have better chances with and while I'd love the simplicity of reassigning the parity drive - just came to my mind reading this post above - and trust that exact drive more ( few months old WD Red Pro vs a WD Red Plus over 5 yrs ) but seems a long shot to me. May I ask for your advice how you'ld resolve this, please? Thank you very much in advance.

nas42-diagnostics-20260728-2222.zip