Introduction
Use this guide to replace the hard drive bracket nearest the front edge of your MacBook Unibody Model A1278. This bracket also contains the infrared sleep sensor and its cable.
What you need
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With the case closed, place the Unibody top-side down on a flat surface.
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Depress the grooved side of the access door release latch enough to grab the free end. Lift the release latch until it is vertical.
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Remove the following eight screws securing the lower case to the chassis:
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One 3 mm Phillips screw.
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Three 13.5 mm Phillips screws.
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Four 3.5 mm Phillips screws.
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Using the flat end of a spudger, pry the subwoofer connector straight up off the logic board.
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Remove the single Phillips screw securing the hard drive bracket to the upper case.
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Lift the hard drive out of its supports and disconnect the SATA cable by pulling the connector straight away from the hard drive.
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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.
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Use the pointed end of a spudger to flip the lock on the ZIF connector.
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Peel the connector side of the sleep sensor cable up from the adhesive securing it to the upper case.
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Insert the tip of a spudger between the hard drive bracket and the front edge of the upper case to free it from its recess.
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Pull the hard drive bracket and sleep sensor assembly out from the recess in the upper case.
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After ensuring the cable is freed of all adhesive, remove the hard drive bracket and sleep sensor assembly from the upper case.
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