Thank you all for your reply. I think I know what caused this problem. I tried to copy the data from the usb device to a powered 3,5" usb drive. The same Biab 2009,5 was installed on. During the copy process I left the room. After two hours I came back and noticed the copy popup screen was closed. So, I assumed the copy process was completed. I disconnected the 2,5" device. Now I checked the event viewer. During the copy process the power of the 2,5" device went down. Strange there was no error message on the screen I that moment. This is what I did so far: I deleted the drivers from the usb host controllers, rebooted the PC (all usb drivers were installed again), connected the 2,5" device. Result: it was recognized again. The next step is to copy all data to the 3,5" usb device. I hope the process will now complete without issues.

Thanks,
Jan R.

piano: Hammond Skx Pro
guitar: Ibanez LGB30
guitar amp: Boss Katana 50 MKII