With the case closed, place the Unibody top-side down on a flat surface. Depress the grooved side of the access door release latch enough to grab the free end. Lift the release latch until it is vertical. /Guide/MacBook-Unibody-Model-A1278-Hard-Drive-Replacement/816/all#s4172 The access door should now be raised enough to lift it up and out of the Unibody. /Guide/MacBook-Unibody-Model-A1278-Hard-Drive-Replacement/816/all#s4348 Be sure the access door release latch is vertical before proceeding. Grab the white plastic tab and pull the battery up and out of the Unibody. /Guide/MacBook-Unibody-Model-A1278-Hard-Drive-Replacement/816/all#s4122 Remove the single Phillips screw securing the hard drive bracket to the upper case. This screw is captive to the hard drive bracket. /Guide/MacBook-Unibody-Model-A1278-Hard-Drive-Replacement/816/all#s4123 Lift the hard drive by its pull tab enough to grab and remove the retaining bracket. Lift the hard drive out of the chassis, minding the cable attaching it to the computer. /Guide/MacBook-Unibody-Model-A1278-Hard-Drive-Replacement/816/all#s4124 Remove the hard drive from its cable by pulling the cable connector straight away from the drive. /Guide/MacBook-Unibody-Model-A1278-Hard-Drive-Replacement/816/all#s4125 Remove the two T6 Torx screws from each side of the hard drive (four screws total). You'll need to transfer these screws to your new hard drive if you're changing drives. If you are installing a new hard drive, we have an OS X install guide to get you up and running. /Guide/MacBook-Unibody-Model-A1278-Hard-Drive-Replacement/816/all#s4442