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How to Upgrade/Replace the Main Drive in a 21.5-inch iMac (Late 2012 - Late 2015) UPDATED - YouTube
How much would a hard drive replacement cost for a 2012 21.5-inch iMac at the Apple Store? Should I get a third party SSD and replace it myself? - Quora
iMac 21.5" (2012-2017) 🖥 Hard Drive Replacement/SSD Upgrade - YouTube
How-To: Now's the right time to swap your old iMac's hard drive for a fast new SSD - 9to5Mac
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iMac 27 2012-2015 Hard Drive Replacement with SSD
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Apple Launches 27" iMac 3TB Hard Drive Replacement Program - MacRumors