Heres how it works there is a way to change mod your gamer-tag if you mean and permanent Gamertag change like your overall GT that would cost a 100$ and only two people in the world know or have the technology to do this how i no i paid him to do so and his AIM=AK47RuNzThis. He is a master hacker that's his job for money he will hack any gamer-tag or mod yours to w/e you want. He is no scammer you can search his aim on Google or youtube! The second choice which is The Call Of Duty gamertag mod which is really easy if you need a tutorial on that just message me. And BTW yes if you have a HDD you will need a transfer cable.!