Einleitung
Since the Hard drive bay is 2.5", you can replace the HDD with either a 2.5" HDD or a Solid State Drive (SSD). Note that SSD's are more expensive compared to HDD's of similar storage size.
Werkzeuge
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            Ground yourself by either touching an unpainted metal surface or by using the Anti-Static wrist strap. 
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            Turn off the computer and remove the charger from the charging port. 
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            Turn the laptop over and slide the battery release catch to the right. The battery will pop up from its slot. Remove it using your fingers 
 
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            The access panel to the hard drive and RAM is held in place by four screws. Loosen them using a Phillips #0 screwdriver. 
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            Gently lift the panel away from the computer. 
 
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            Remove the two 6mm screws using the Phillips #0 screwdriver. 
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            Gently remove the hard drive from the socket. 
 
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To reassemble your device, follow these instructions in reverse order.