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Thank you for your response, OK, I mostly expanded, and/or explained acronyms, and added reference links of abbreviations.

Hello,

Used Testdisk for the first time, but can't see how to recover all data after 3 days, although it should be rather easy ...

Summary

I have a 3TB secondary data disk that was holding a big Linux LVM Physical Volume (PV) + Logical Volumes (LV).
I lost access to it after mistakenly ...