I bought a second external hard drive (with dual USB cable) and I am attempting to use data management to copy the contents of my existing hard drive to the new one. When I select the 168 items in data management, the amount of storage selected (green bar) doesn't match the total amount of storage used. It is out by about 100GB. The copy is taking ages, about 75/168 titles done after about 12 hours so I have a bit to go. Question I have is how to I ensure I have copied everything from one drive to another? Is there some issue with Wii U disc management where you can't select everything, a limit of 168 titles showing maybe? Is there any other way to clone a drive?