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Model A1418 / Late 2012 / 2.7 & 2.9 GHz Core i5 or 3.1 GHz Core i7 Processor

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Is my Startup Disk Compatiable with 21.5” Late 2012 EMC 2544 iMac?

Hello. Let me explain my situation before the question.

I pulled out my Crucial MX200, 500 GB SSD from a 2009 Mac Pro that I had sold. I then installed the drive inside an external enclosure. I hooked up the external enclosure to the USB port of my families 21.5” Late 2012 iMac. To use it on the iMac I choose Apple () menu > System Preferences, then click Startup Disk. Well my family got a new Mac and I inherited the 21.5” Late 2012 iMac.

My question is...

Does anybody know if my Crucial MX200 can be installed internally into this iMac and will it function properly ? Or is it better for me to keep it as an external startup disk? I tried researching on the Crucial website but I could not find anything.

Thank you

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Thanks, I think I am going to go with an OWC blade and use a thunderbolt external enclosure.


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Not sure it offers that much benefit here.

Your new iMac only has one SATA port which likely has a HDD mounted which is likely larger that your 500 GB SSD. While your new iMac can support two drives the second drive needs to be a special blade type SSD as you can see here unlike your older system:

Block Image

If your system is setup with a Fusion Drive then it already has a SSD mounted.

Keep in mind the OS installed on your older SSD is too old to run your system. So you would need to upgrade it to the newer Sierra or High Sierra MacOS if you want to make it bootable for your new system. I would point out if you got an external Thunderbolt case to mount your SSD to you can gain still more performance! Then boot up under it.

Update (04/01/2018)

OK, what will it take to put in the 2.5" SSD.

First if you haven't taken off the display of the newer 'Thin Series' iMac's review this guide: iMac Intel 21.5" EMC 2544 Display Replacement It's a bit of work! And if you're not careful you can damage the display! You'll need to get the proper tools which is part of the adhesive kit: iMac Intel 21.5" (2012-2017) Adhesive Strips and iFixit Opening Picks (Set of 6)

Here's the full IFXIT guide to get to the HD: iMac Intel 21.5" EMC 2544 Hard Drive Replacement. The only problem you'll have here is the SMART services in this drive is quite old and I suspect the system won't be able to interface properly so your systems fan will run hard.

Frankly, I would spend the effort going with the custom Apple blade SSD, while a more expensive solution will give your system much more performance. If you really want something internal. Otherwise I would leave the current HDD alone and just get the Thunderbolt case to house the SSD. If you get a multi-bay case you could get a second SSD and then RAID them to get even better performance than replacing the HDD out and you don't need to open the system!

iFixit Opening Picks (Set of 6) Изображение


iFixit Opening Picks (Set of 6)


iMac Intel 21.5" (2012-2017) Adhesive Strips Изображение


iMac Intel 21.5" (2012-2017) Adhesive Strips


iMac Intel 21.5" EMC 2544 Display Изображение


iMac Intel 21.5" EMC 2544 Display Replacement



1 - 2 hours

iMac Intel 21.5" EMC 2544 Hard Drive Изображение


iMac Intel 21.5" EMC 2544 Hard Drive Replacement



25 minutes - 1 hour

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Thanks for the input.

Do you know if there is an adapter for an SSD to fit the HDD on the iMac?

No Fusion Drive here, it has a standard 1 TB 5400 RPM HD. FYI, my Crucial SSD has the latest version of El Capitan on it.

Thanks for the tip on the Thunderbolt external enclosure, I forgot the iMac had Thunderbolt.


So you want to loss the deeper storage of your current drive to gain the speed of the SSD.

I'm not sure it makes sense here given whats involved and the costs.


The iMac will be opened up regardless for a repair, so I figured why not swap out the HDD for an SDD. I pretty much just have my OS X on my SDD and the majority of my data is on an external drive. Also the HDD is from 2012 and I’m worried it will fail in the future so why not replace it now with an SSD since the iMac will be opened for a repair.


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