Instructions
Remove the Hard Drive
Turn off your Xbox 360 system.
Turn the system vertically. The USB ports should be at the bottom and the hard drive at the top.
Press the hard drive release button at the top of the system. This causes the front of the hard drive to pop up.
Remove the hard drive from the system by lifting off the front, where it released, first, and then the back.
Attach the Hard Drive
Turn off your Xbox 360 if it isn't already off.
Turn the system vertically so the empty hard drive bay is at the top.
Place the larger end of the hard drive into the back of the bay.
Set the front, narrower end, of the hard drive into the front of the bay. The hard drive should snap into place when the release button connects.
Turn on your system and the Xbox recognizes the hard drive right away.