I have an EA 6200.
When I plugged in a seagate expansion HDD into it at first it could see the HDD and the media center worked fine. But at one point a plugged the HDD into my PC to see if I can change some permissions on it ( previously I couldn't do that while the HDD was plugged into the router) and I now the router doesn't find the HDD when I plug it back in.
I even formated the HDD to see if it resolved but it didn't and I'm at loss about finding a solution for this.