PhatHack MM also has options to transcode media to a flat format. Obviously this will cause the transfer process to be slower while it does this, so it's a trade off on how you want to proceed.
Once I get my CarPC back up and running (car has been off the road for a while with a damaged axle), I'll be looking to fix / re-write it, so if you do use it and need things sorting out, let me know!