When you formatted the hdd, you should have made the FAT32 active and primary, If you open the drive with easeus partition manager then it should show you if the drive is active and primay.
Go into the global setting of your usb loader and make sure the IOS is set to IOS222.
here is a dual parition I have set up.
im using the FAT32 Hard Drives - Formatting, Loading, Ripping, Playing guide. so i should be set in terms of the ios. and my hdd should be set up correctly.