Cloning is typically a direct copy of 1 drive to another. When you clone from a larger drive to a smaller drive, the first thing is that the larger drive must have less overall data on it than the capacity of the smaller drive to start. If you can move enough data off of the larger drive to get below the 500 GB's of this drive, then a clone is possible. Not all cloning software is the same, some will not clone from a larger drive to a smaller one, and as such, you will have to find the right one for this situation.