I got 1 external HDD filled with movie, connected via USB to my netbook that using Xubuntu as it OS.

This netbook also connected to internet using an USB CDMA modem, which is already shared to the network using unused adsl modem (set to full bridge), so everyone surfing the internet using my netbook as server.

I want to share this external HDD to network so other pc using windows 7 could watch the movie.

Please explain how to do that.