Things You'll Need
Instructions
Power down the Xbox 360 and disconnect all accessories from the console except for the A/V and power cords.
Connect the HDD you want to transfer data from to your console&'s hard drive bay. This HDD&'s data will transfer to the other Xbox 360&'s HDD.
Turn the console back on, connect a controller and log out of all profiles if necessary.
Remove the HDD from the other Xbox 360, if necessary, and connect it to the HDD transfer cable&'s HDD input. This is the HDD that you will transfer data to.
Connect the other end of the HDD transfer cable to one of the USB controller ports on the front of your Xbox 360 (the console with your HDD attached.) By the end of this step, the HDD from the other Xbox 360 will be connected to your console via HDD transfer cable and your HDD will be connected to your console&'s HDD bay.
Insert the setup disc included in your Xbox 360 HDD Transfer Kit and allow the disc to run on your Xbox 360.
Read the setup instructions introduction, then select "Continue" to advance to the transfer screen.
Choose "Transfer Content" to transfer data from your HDD to the other HDD.