Introduction
Replace the 120GB SSD hard drive with an equal or larger hard drive.
Tools
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            Flip the computer over. 
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            Remove the six screws with a 2 mm Allen key. 
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            Carefully remove the back panel, as well the left and right panel. 
 
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            Using a Phillips #2 screwdriver, remove the four screws on the heatsink that cools the processor unit. 
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            Remove the heatsink. 
 
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            The SSD is now visible. 
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            Now flip the computer over and use the Allen wrench to loosen the 1.5 mm screws fixing the SSD. 
 
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                            Conclusion
                          
                          To reassemble the device, follow the instructions in reverse order.