I have just bought a new 3tb external hard drive. I want to transfer movies from my old WD external to the new one. However when I try to do it it just goes back to where it was. Can you please help me.



Please make sure your new drive is formatted for Mac. 

Please see if this will help:  How to partition and format a WD drive on Windows (8, 7, Vista, XP) and Mac OSX