I have an old computer with Win 2003 Server. It got 6 USB connectors. At four of them the Drobo connects (a drive letter is assigned and it is visible in an explorer) and gets disconnected after a few seconds. Half a minute later it connects again and then disconnects. This repeats forever.
The connection seems to be more stable at the other two USB ports. The problem is that writing seems to be in bursts. When I copy a large file (2GB) the progress indicator freezes about 4 times for a couple of seconds. Total time to copy is slightly more then 2 minutes. (Average speed about 15MB/s)
I would guess that the problem is in my computer, not the Drobo, but it is still a mystery to me. The USB drivers are standard Microsoft ones and they are not reporting any problem. Other equipment work fine at all 6 USB ports.
I have formated it to 16TB so I can’t test it at my Win XP workstation. I will try to borrow a Vista laptop and see if it makes any difference.