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With the Windows Disk Management Utility I erased the Partition “Lab3_F” of my 3 TB hard disk.
No further actions took place.

Afterwards I used Testdisk to recover it:
That time Testdisk showed both partitions “Lab3_D” and “Lab 3_F”.
My intention was no changes on "Lab3_D" and a recovery of "Lab3_F".
Due to a misunderstanding of the Handbook I marked only the partition “Lab3_F” as “Primary” and left the other entries open. I assumed in TestDisk no marks means no action. That was obviously wrong.
After the succcessful recovery of “Lab3_F” my partition “Lab3_D” was gone !
No further actions took place.

Now the Windows Disk Management utility shows: The normal search with Testdisk showed overlapping partitions, so I ran a deep search which took some days: or as a text:
Disk /dev/sdb - 3000 GB / 2794 GiB – CHS 364801 255 63
Partition Start End size in Sectors
> MS Data 264192 3812530175 3812265984 [Lab3_D]
MS Data 264192 4278450175 4278185984 [Lab3_D]
MS Data 264192 5860530175 5860265984 [Lab3_D]
MS Data 587558865 587561744 2880 [NO NAME]
MS Data 587559467 587562346 2880 [NO NAME]
MS Data 587560539 587563418 2880 [NO NAME]
MS Data 587560979 587563858 2880 [NO NAME]
MS Data 600271204 600274083 2880 [NO NAME]
MS Data 629361923 629368096 6174
MS Data 629368096 629374269 6174 [Boot]
MS Data 630546139 630552312 6174
MS Data 630552312 630558485 6174 [Boot]
NTFS found using backup sector, blocksize=4096, 1113 GB / 1036 GiB

My questions are:
Where is the obviously active Partition “Lab3_F” in this table?
What next action do You suggest to recover ”Lab3_D” and to keep “Lab3_F“?

You have to set all partitions for recovery.
If a partition is not set, the partition won't be available anymore.
You must write your complete partition table containing all partitions.

Fiona

Thank You very much for Your fast answer.
When I mark the first entery as Primary TestDisk shows up with "Structure OK"

All other lines below reply structure bad! Do You have any sugestions ?

Martin

TestDisk found a couple of partitions labeled as Lab3_D but not Lab3_F.

Your found Lab3_D partition have different size and overlap.
That's why you can't recover partitions which are using the same space!
Only one partition would be possible.
You should check/mark your partitions and press p to have try to list your files.
Please let me know which partition lists your data.
Please check your "No Name" partitions also.
It's intended to exclude, that your label is not changed.

Fiona