Introduction
Tools
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            Disconnect the hard drive thermal sensor from the logic board by pulling its connector toward the top edge of your iMac. 
 
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            Lift the left edge of the hard drive slightly, then pull it toward the left edge of the iMac. 
 
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            Rotate the hard drive out of the rear case. 
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            Disconnect the SATA data cable by pulling its connector away from the hard drive. 
 
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            Disconnect the SATA power cable by pulling its connector away from the hard drive. 
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            Remove the hard drive from the iMac. 
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.