I opened a topic on RME forum, there the purpose :
“Hello happy RMErs,
That’s the story. I work on Nuendo 5 and ProTools 9 with a PC (HDSP MADI) and a MacBook Pro (2009/03 ). I have all the problems discussed hhttp://www.rme-audio.de/forum/viewtopic.php?id=974 and http://www.rme-audio.de/forum/viewtopic.php?id=1475.
I tried working on Nuendo with a WD external HD with two FW800 connexions, and with an ExpressCard FW800 adapter with no success, cracks & pops.
This morning, I tried with ProTools and what ?
As I seen on the sticked topics, my MacBook Pro isn’t a good start, but I wonder if my FF800 is faulty or not.
Any held will be appreciated.”
So the FF800 is potentially faulty, but works in analog with ProTools, but is unusable with Nuendo. If someone can tell me why, he wins a chocolate medal !