recovery was finished, so I unplugged the target hdd to copy the data to my nas.

Reviewing the data I assume that ALL LOST DATA WAS RECOVERED. I want to thank you very much for your quick and succesfull help!!

As there are several people having the same problem with hdds extracted from synology or other nas systems, maybe the changes made for my application might be usefull to integrate in the next versions?

Again, thank you!! Best regards,
Florian