I can't access anymore to data on my USB stick.

Voir l'image en grand
When I plug the USB stick in, Windows displays:

Voir l'image en grand
So I use testdisk and proceed on the selected line:

Voir l'image en grand
I choose Intel/PC Partition (automaticly testdisk is on this option) then analyse.

Voir l'image en grand
No partition is found during Quick Search:

Voir l'image en grand
I do a deeper search but still no partition found:

Voir l'image en grand
If I try Advanced, it said that I have no partition available:

Voir l'image en grand
Do you know how can I have the data back ? None tools detect any files on the usb stick.
Thanks in advance for your help.
Regards,