Ok, you pretty much confused me there lol. Yeah, you can transfer data from one harddrive to another with Xbox 360 Hardrive Transfer Cable. If you have one already then use that. If not then it will cost you $6.5 depending where you live.
For Online Buying http://www.zeromartz.com/xbox-360-ha...ble-p-778.html
Heres a Video of How to Transfer if you need any help;