Plug phone into PC. Mount SD card. Open My Computer, then the Removable Disk. Press "CRTL+A", then "CRTL+C". Create a new directory somewhere (I put it on the desktop) and open it. Press "CRTL+V".
Do the partitioning...
Go back to the folder you recently created, press "CRTL+A", then "CRTL+C". Open My Computer, then Removable Disk, then press "CRTL+V".