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Just to let you, and everyone else reading this topic, know that setting the last partition to primary saved the day, even though it wasn't a primary before (see screenshot, simple volumes do not live in primary partitions)
4th Set As Primary.png

This leaves me with one final question, but ...

Won't that make it unrecoverable? Since it's actually an Extended with a logical Volume inside (at least before it vanished)

It has never been an "Extended with a logical Volume inside" as there is no space for an extended one.
Looking at the partition table strongly suggests that you have put ...

Won't that make it unrecoverable? Since it's actually an Extended with a logical Volume inside (at least before it vanished)

Would it make a difference if I used something like Reflect Macrium to put a bit of space between or would that destroy the partition and make it definitely unrecoverable ...

Stages 1, 2 and 5 is what gives me the creeps... other than that I could recover the contents of this partition and the first 3 partitions seem to be error free according to Windows10

This is what I am working with, the volume that was in the green area just up and disappeared out of the blue.
https://i.imgur.com/bHufhip.png

Stage 1
https://i.imgur.com/pD1i5G5.png

Stage 2
https://i.imgur.com/9tOFvvk.png

Stage 3 - Partition to be recovered outlined in red
https://i ...

Hi,

Yesterday I suddenly lost the single volume in an Extended LBA partition (I think this is what they call a logical partition?)
After the first panic and madly searching for anything to recover this partition, my son pointed me this TestDisk page , bless him for that.
After reading through it I ...