I have a FW800 4 bay Drobo which is giving me performance problems. It works but it is very slow to write to, and when I say slow I mean sloooowww. Copying a couple of gigabytes (which takes 10 minutes to a USB drive attached to the same Mac) takes a minimum of 2 hours. I copied 50,000 files last week and what took me about 20 minutes to another drive took 36 hours to the Drobo. It was connected via USB but I have just changed it to FW400 and I have the same problem - I don’t have FW800 on the Mac in question. Obviously I have a problem but where do I start looking ?