I would suggest using robocopy.
If you aren't familiar with the command line, you could use this to help with the process.
http://betterrobocopygui.codeplex.com/
In thinking about this a bit more, you may just want to stick with a gui based utility such as teracopy.
http://www.codesector.com/teracopy.php
Its very easy to use and would likely be a good deal quicker more reliable then just copy/paste from within explorer.