Things You'll Need
Instructions
Turn off the console and leave the existing hard drive attached. Disconnect all other accessories from the Xbox 360. Grab a controller and hit the center "Guide" button to turn on both it and the console.
Connect the transfer cable to the destination hard drive and the Xbox 360 console. The plug for the console will connect to any available USB port.
Open the console's disc tray and insert the hard drive transfer disc. Once the system reads the disc you simply follow the on-screen instructions to complete the transfer. This can take a few hours if your hard drive contains a lot of content.