What is that shiny cover for?

Lankyman

macrumors 68000
Original poster
May 14, 2011
1,927
711
U.K.
I have often wondered when I have cracked open my iMac what the big shiny disk with the wire attached is for in my iMac. It sits under where the HDD is installed. Does anyone know - see image.
 

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SaSaSushi

macrumors 601
Aug 8, 2007
4,084
479
Takamatsu, Japan
I believe your are referring the rear Apple logo.

See step #23 in this iFixit teardown.

The Apple logo is no longer just for looks, it now has a job to do. Earlier aluminum iMacs had an aluminum front and a plastic back. In contrast, this iMac features an all-aluminum enclosure, which is great for looks, but terrible for Wi-Fi. The Apple logo is the only plastic area on the back of the iMac, and Apple has integrated an AirPort antenna into that space.
 

Lankyman

macrumors 68000
Original poster
May 14, 2011
1,927
711
U.K.
Ah! so that’s what it is and if so I now understand the logic. Each time I have opened up my iMac I have pondered over what it was for. I have to confess although I have looked at the ifixit tear downs numerous times I had obviously not been paying close enough attention.

Thank you for the prompt replies.