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Hello, firstly thank you for you time. I want to replace the Hard Disk of my iMac (iMac Intel 21.5" EMC 2428), for a SSD, I was searching the SSD here in the Store, but is not available. My question is, what kind of SSD I need to buy, or what are the requirements that I need in order to chance it for the HD of my computer. I saw in others iMacs that they allows to chance the optical disc for a SSD with this adapter ( iMac & Mac mini Dual Drive Enclosure ) My question is, if this adapter is compatible with my iMac, I was searching information in the forum, but i don’t find nothing. That are my two questions, thanks for your time

First your system has three SATA ports! Currently your Hard Drive & Optical Drive are taking two ports now, leaving one port free. I would recommend you leave your HD in (as long as its working). As well as leave your Optical Drive alone here. Instead, use this kit to add in a 2.5" SATA SSD: iMac Intel 21.5" Mid 2011 Dual Hard Drive Kit. While the title implies a second Hard Drive in fact either a HD or SSD could be used! Follow this IFIXIT guide on installing your drive: Installing iMac Intel 21.5" EMC 2428 Dual Hard Drive Kit. As to what SSD to install: You’ll need a 2.5" SATA unit. I like the Samsung 850 EVO unit. There are others which are just as good.

iMac Intel 21.5" EMC 2428 Hard Drive Replacement Enjoy!! Follow these steps to change it… you can change it for any other HDD or SSD with the same interface (SATA)