I have an AirPort Express with a 1 TB harddrive, obviously this airport is connected to the internet and in the next month our house will be conected to the optic fibre network giving us 200 megabits/seconds connection speed. Now to me this looks like a great opertunity to store some fairly large files on a shared disk.
One problem is that the AirPort Express also functions as the backup device, so ideally we would only split of 100 GB so as to allow the other 900 GB to continue functioning as a Time Machine. Idealy this would be approachable from both inside and outside the network (with passwords!) so that I can connect to it from a university as well as at home.
Additionally the network has the following operating systems connected to it that would ideally also be able to connect to the harddrive: OS X Yosemite, Ubuntu 14.04, Windows 7 and probably in the near future a Linux Mint installation.