In this case, I meant the original 120gb hard drive. That's the reason why I synced it and left it running with the apple OS. I had to upgrade the battery (bought some cheap ones via aliexpress) and now it works like a charm. The only issue was the first charge, it took the ipod a while to recognise the battery, so having a fire wire cable to feed it the first time should do the trick. Since then, this little grandpa is still rolling for more years, I hope!