Hello Safeboot, and thank you for your reply.
This doesn't really helps because both devices share the same device instance path which is USBSTOR\Disk&Ven_Generic&Prod_USB_Flash_Disk&Rev_1100\08AD000000018267&0 so again both are exempted.
The only unique identifier that these devices have is the ContainerID, but I don't know whether EEFF will accept it in some way...
it would seem all your devices have the same serial number - That's a manufacturer issue unfortunately - usually each stick has a unique serial number.
The container ID is a GUID assigned by Windows.
Hmmm, you are absolutely right about that.
I just double checked this, and they do not share the same Device Instance Path. My mistake.
But for what reason do they both get exempted, if they have a different serial number?