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Model A1419 / EMC 3070 / Mid 2017 / 3.4, 3.5 or 3.8 GHz Core i5 or 4.2 GHz Core i7 Kaby Lake Processor (ID iMac18,3) / Retina 5K display. Refer to the older iMac Intel 27" Retina 5K Display (Late 2014 & 2015) guides as the system is very similar.

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Converting a Fusion drive to two separate drives.

Greetings all;

I purchased a used subject iMac above that has a weak Fusion drive system. What I want to do is replace the SSD blade with a 2 TB version and the hard drive with a 4 TB SSD. In the long run, use the SSD blade as the main macOS drive and the other SSD for data.

Which 2 TB SSD blade would work for the iMac and which 4 TB SSD would be most suited for the iMac?

I already took care of the RAM.

Thank you for your advice.

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A 2 TB Apple blade SSD will be quite expensive! I would recommend staying with the 1 TB drive like Samsung SSPOLARIS 1 TB This is the custom Apple SSD. It is by far the fastest drive available. The next choice would be OWC Aura Pro X2 1 TB or if you really need a 2 TB drive OWC Aura Pro X2 2 TB. Keep in mind OWC does not support using this drive due to the complexity in getting to the connector. I can tell you it works just fine in the iMac.

Why do you think you need such a large blade SSD when you are planing on adding a second SATA SSD for your data?

Remember you’ll use the blade SSD as your boot drive with your apps and really nothing else! The rest of the drive will be used for Virtual RAM, Paging, and depending on your app the scratch space. So depending on your use this is where you need to think how much free space do you really need. I could see someone doing video editing might want more scratch space on the fastest drive the system has but I haven’t seen many people going this far on this system, most use iMac Pro’s as the number of threads this system only offers 8 threads.

As for the SATA drive I would go with a Samsung 860 EVO

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Thank you Dan;

I just want my iMac to be a closed system. I will review to see if the 1 TB blade is enough. Didn't want to have any dangling cables for the iMac. Yes, the Apple special blades are expensive and wanted to know if there are good equivalent cheaper ones. You gave very good selections there.

Thank you for informing me on how the blade SSD is utilized.

A good response, yes, I’ll accept your answer.

Thank you.

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@macsba - Don't forget to score the answer as well ;-}

I do want to add before you alter your system you'll want to split the Fusion Drive set before you alter the drives How to split up a Fusion Drive for High Sierra.

Its a bit different in Mojave! Here we need to look within Terminal for the Fusion Drive container diskutil apfs list and then delete the container diskutil apfs deletecontainer diskX where X is container which states its the Fusion drive as an example Container disk2 - APFS Container Reference: disk2 (Fusion)

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Thank you Dan. The macOS installed in the iMac is Mohave version 10.14.5. I do have plans to clone the fusion drive before doing anything else. From what you're saying is the controller on the logic board will still see the replaced blade and SATA drives as a fusion drive. Am I reading you right? Thank you.

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@macsba - Don't Clone! Backup (TimeMachine or other) or just copy off your stuff.

Majave uses APFS not the older HFS+ Cloning apps have has issues with APFS file systems which is why you don't want to use it.

Both the system EFI (BIOS setting) as well as the drive have elements which get in the way. Which is why we need to alter it within terminal.

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Wow Dan;

Thank you for this section "Both the system EFI (BIOS setting) as well as the drive have elements which get in the way. Which is why we need to alter it within terminal."

I'll just copy my home folder. Then do the split as you stated. Just waiting for the replacements to arrive and have a Mac shop do the changes. Removing the display section seems to be above my skill level. After everything is back to normal, I'll give (and others) the update.

Thank you.

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