Acronis Disk Director (trial) or MiniTool. I also recommend you use Wad Manager 1.7 to re-install DIOS MIOS v2.10 with IOS236. Also make the partition active and primary and first(USB1) the games folder has to be in USB1 in all the USB Loaders, will not work if the games folder is in USB2 or USB3. Use one of the latest USB Loaders: CFG v70r65, GX r1217,WiiFlow 4.2.
For USB Loader GX, go into settings>custom paths, and change the path from SD to USB1:/games/;
Use DM Tool Box or USB loaders to install the games.