Introduction
Prerequisite-only guide to remove the hard drive in an iMac 27" 2017.
Tools
Parts
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Grab the hard drive and left hard drive bracket together.
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Tilt the left side up away from the rear case, and slide the assembly to the left.
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Remove the hard drive and left hard drive bracket from the iMac.
 
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                            Conclusion
                          
                          To reassemble your device, follow these instructions in reverse order.