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.