I plan to get an Airport Extreme soon to replace my faulty router and i was wondering the network disk i can plug to it, can it be divided into multiple partitions? For example have 128gb of it assigned for a time machine and the second partition for file sharing. Also how fast is it? Can i stream HD video from the network disk flawlessly from it? Or would i have to download the file to my device for smooth playback? Thanks in advice for the feedback