found it !!! unbelievable…
the thunderbolt ext. drive was not formatted properly.. just right out of the store… after reformat the drive… it works !!!
It has files on it and you can use it, but not in Thunderbolt speed.
It will transfer regular files and stuff but has a big problem while getting written constantly. runs until the last buffer overruns, then stops.
so now everything works fine. tested also with a simple firewire ext and a USB3 external… all worked.
wouter..the 16bit is just because its more rockn roll 
IDR48 & T112, iPad, Belkin Wireless, Dante, Lenovo i5, Samplitude ProX
