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/Installing-MacBook-Unibody-Model-A1278-Hard-Drive-Cable/759/all#s4172 The access door should now be raised enough to lift it up and out of the Unibody. /Guide/Installing-MacBook-Unibody-Model-A1278-Hard-Drive-Cable/759/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/Installing-MacBook-Unibody-Model-A1278-Hard-Drive-Cable/759/all#s4122 Remove the following eight screws securing the lower case to the chassis: One 3 mm Phillips screw. Three 13.5 mm Phillips screws. Four 3.5 mm Phillips screws. /Guide/Installing-MacBook-Unibody-Model-A1278-Hard-Drive-Cable/759/all#s4127 Using both hands, lift and remove the lower case off the upper case. /Guide/Installing-MacBook-Unibody-Model-A1278-Hard-Drive-Cable/759/all#s4128 Using the flat end of a spudger, pry the subwoofer connector straight up off the logic board. /Guide/Installing-MacBook-Unibody-Model-A1278-Hard-Drive-Cable/759/all#s4131 Disconnect the camera cable by pulling the male end straight away from its socket. /Guide/Installing-MacBook-Unibody-Model-A1278-Hard-Drive-Cable/759/all#s4133 Use a spudger to pry the optical drive connector straight up off the logic board. /Guide/Installing-MacBook-Unibody-Model-A1278-Hard-Drive-Cable/759/all#s4134 Remove the two Phillips screws securing the subwoofer to the upper case. The longer of the two screws is on the right. /Guide/Installing-MacBook-Unibody-Model-A1278-Hard-Drive-Cable/759/all#s4132 The subwoofer is still connected to the right speaker, so don't completely remove it just yet. Lift the subwoofer off the optical drive, and set it above the computer. /Guide/Installing-MacBook-Unibody-Model-A1278-Hard-Drive-Cable/759/all#s4135 Remove the two Phillips screws securing the camera cable bracket to the upper case. The leftmost screw may remain captive in the camera cable. /Guide/Installing-MacBook-Unibody-Model-A1278-Hard-Drive-Cable/759/all#s4136 Remove the three 2.5 mm Phillips screws securing the optical drive to the upper case. /Guide/Installing-MacBook-Unibody-Model-A1278-Hard-Drive-Cable/759/all#s4137 Lift the optical drive from its right edge and pull it out of the computer. The hard drive cable may become disconnected from the logic board when removing the optical drive. Ensure it is connected during reassembly. /Guide/Installing-MacBook-Unibody-Model-A1278-Hard-Drive-Cable/759/all#s4138 Remove the single Phillips screw securing the hard drive bracket to the upper case. This screw is captive in the hard drive bracket. /Guide/Installing-MacBook-Unibody-Model-A1278-Hard-Drive-Cable/759/all#s4140 Lift the hard drive by its plastic pull tab and remove the freed hard drive bracket. /Guide/Installing-MacBook-Unibody-Model-A1278-Hard-Drive-Cable/759/all#s4141 Lift the hard drive out of its supports and disconnect the SATA cable by pulling the connector straight away from the hard drive. /Guide/Installing-MacBook-Unibody-Model-A1278-Hard-Drive-Cable/759/all#s4142 Remove the four 10.3 mm Phillips screws securing the mid wall to the upper case. /Guide/Installing-MacBook-Unibody-Model-A1278-Hard-Drive-Cable/759/all#s4143 Lift the mid wall out of the upper case. /Guide/Installing-MacBook-Unibody-Model-A1278-Hard-Drive-Cable/759/all#s4144 Use a spudger to pry the hard drive cable connector straight up off the logic board. /Guide/Installing-MacBook-Unibody-Model-A1278-Hard-Drive-Cable/759/all#s4145 Peel the hard drive cable from the adhesive securing it to the upper case, and maneuver the plastic retaining block out of the upper case. During reassembly, be sure the two pins on top of the plastic retaining block mate to the holes on the underside of the midwall. /Guide/Installing-MacBook-Unibody-Model-A1278-Hard-Drive-Cable/759/all#s4146 Peel the hard drive cable from the adhesive securing it to the upper case, and maneuver the plastic retaining block out of the upper case. During reassembly, be sure the two pins on top of the plastic retaining block mate to the holes on the underside of the midwall. /Guide/Installing-MacBook-Unibody-Model-A1278-Hard-Drive-Cable/759/all#s4146