Instructions
Power down your Xbox 360 with the exisiting "source" drive attached.
Remove all accessories from the Xbox 360.
Connect a controller and power up your Xbox 360.
Plug the transfer cable into your "destination" drive.
Insert the opposite end of the transfer cable into a USB port on the Xbox 360. These are located on the back of the console.
Load the included transfer disc into your Xbox 360's disk drive. Follow the onscreen instructions to complete the data transfer.