|Yes, transferring data between two devices on the same network is a good way of checking bandwidth.|
I see you're using windows 8. I haven't touched it myself but I'm willing to bet it has the "Network" tab on the Task Manager like most previous versions of Windows. If it does, you open it and then initiate the transfer.
You can watch real time while the transfer is happening and it will tell you what percentage of your available bandwidth is being used and give you a nice graph to show you as well.
If you have (for example) 100 Mbps of available bandwidth and you use 70 percent, you know you're getting about 70 Mbps of bandwidth.
Don't forget, when dealing with bandwidth, you'll never utilize the full amount available to you as a certain percentage (around 10 to 15% in my experience) is used up in overhead. So if you're only getting 70 to 85% of your advertised bandwidth, that's actually spot on.
It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.