if I'm not mistaken, error 6 means the console cannot unlock your hd. In otherwords, you got a locked hd from somewhere and just try to couple it with the xbox motherboard. Since you have a modchip installed, go and buy a new drive or take any extra PC drive you have lying around then format the drive and install a dashboard onto it. If purchasing a new drive, make sure to get a lockable drive if you plan to play on live.