Unmountable: Unsupported Partition Layout on 6.11.5

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I just upgraded from 6.8.3 to 6.11.5


On one of my disks I get the error Unmountable: Unsupported Partition Layout 


Reverting back to 6.8.3 got it to mount again (phew!), but now I cannot upgrade without facing the same problem... not sure what to do?


A while ago (sometime last year) I updated and the same thing happened so I stopped updating for a while.  Now here I am facing the same issue again :(


I have attached a diagnostics dump - would be incredibly grateful to anyone who can shed some light on this for me.


Edited by napalmyourmom
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6 hours ago, JorgeB said:

Assuming you have valid parity update again, unassign that disk and start the array, Unraid will recreate the partition so the emulated disk should mount, if yes and contents look correct rebuild on top.


So I have to actually rebuild the 10tb of data on this disk?


What is actually causing this?  If the partition/data were truly corrupt, it shouldn't be functional when I downgrade.


I just want to avoid having to deal with this ever again...



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9 minutes ago, napalmyourmom said:

So I have to actually rebuild the 10tb of data on this disk?



9 minutes ago, napalmyourmom said:

What is actually causing this? 

Something in the partition layout is not correct and as Unraid requires, IIRC it was an MBR issue for disks that still had the preclear signature there.

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