I am having a small issue and want to know if others have had the same thing. My network at home consists of an Airport extreme that I have plugged in a TB hard drive. The items I have plugged into the airport are (the wires run under the house and span about 10m or so) an iMac, apple tv (old one) PS3 and wireless I have running a Wii, macbook, macbook pro and two iphones. Everything works great however I found an old airport express of mine and wanted to place that in the bedroom, I did that and extended the network to include it so I can use air play through out the house, this all started working however all of a sudden the HDD that is attached to the Airport Extreme vanishes?? If I remove the airport express from the set up it comes back. This makes no sense, please help.