Well, I've never used file>send, so I can't help much there. Sharing the disk means exposing it to the network. I'm assuming that you do have both computers on a network. Is that the case?

If this is Microsoft Windows, certain versions make sharing hard. But you only need to share from one device, either of them will work. What versions do you have? The full name that is. If your OS isn't crippled (some are), sharing is very, very easy.