Is this possible?

My computer is connected to a router (as is my XBox).

Can I access the external drive attached to my XBox 360 through my router?
Just makes it easier than unplugging it evertime I need to update the drives contents.

The reason I'm asking is cos my 360 is more used as a media centre than a console and stores everything on the drive to access it.

I dont really want to stream from my PC as I dont want to leave it on all the time. Transfering to my External drive would be far easier.

Plus, can AVI's, MP3's JPG's etc be stored on the interal drive on my XBox Elite without having the stuff on CD first?