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I did not find any files in any of the big partitions.
TestDisk reports of the file systems to be broken.
I was thinking about changing the geometry of the disk in testDisk's settings in accordance with the label on the hdd.
The label says:
LBA: 7814037168 sectors
CHS: 16383/16/63.
nothing about ...

Ok. So I will try to shead som light...
I formatted the HDD some 5 years ago running windows 7.
I think windows 7 puts a EFI partition of about 100MB in the beginning of the HDD.
The drive was formatted as one whole partition of approximately 3,7TB or 4TB depending on definition of TB.
now a couple ...

What do you mean by "As you kept the previous partition structure a secret" ?
Is there more information you or TestDisk need to better recuperate the hdd?

Is it ok now?

I'm on a Linux machine.
I have written a 8GB iso file to a 4TB HDD by using the linux dd command
dd copies bit wise from source to destination.
I used: "sudo dd bs=4M if=./div.iso of=/dev/sdb conv=fdatasync status=progress" which means that the block size on the target write was 4MB.
The 4TB hdd was ...