I have an external HD connected to my airport extreme and I don't face any problems accessing the HD from any computer that is connected to the same router (wired or wirelessly). However, the top floor of my house is out of reach for the wireless signal. Thus, I have a wired connection going from the airport router to the top floor. I could technically just plug this ethernet cable into my computer on the top floor and then I would be able to access the internet and the external HD with no problems. But, what I have done instead is I have connected the ethernet cable to another router on the top floor (because my macbook air doesn't have an ethernet slot). This allows me to use the internet, but I can't figure out how to connect to the external HD (if possible). Please do let me know if this will be possible. Thanks.