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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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Can I replace the HDD part of a 2 TB fusion drive with a SATA SSD

Can I replace the HDD part of a 2 TB fusion drive with a SATA SSD (Samsung EVO) and leave the 128 GB Apple PCIe NVMe SSD in place? Can I use both as two separate SSD drives?

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What are you trying to achieve with this move? Have you studied the concept of a fusion drive setup?

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fusion is based on optimizing io-performance through storage-tiering with fast and slow drives

wanna split the fusion drive and have only SSD storage in mac

buying a SSD only mac is much more expensive and is lacking SATA cable wich is hard(er) to add, looking to only replace the hdd if possible

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mmm...

If you haven't bought your system yet I would get the bigger straight SSD model (sans the HD). Getting the needed SATA cable is not hard. But getting the custom Apple SSD is quite difficult! Get the largest you can afford. Then for now just get an external Thunderbolt or USB HDD drive.

In a year when the warranty has expired think about upgrading the system with a second internal drive. By that time the SATA SSD options will be cheaper.

Opening up the newer 'Thin Series' is a bear and if you're not careful its quite easy to damage the display which would be a very expensive Opps! Besides Apple won't honor any warranty repairs (first year) if you've opened the system.

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I saw a OWC video, connecting a SATA cable to the MB requires a complete disassemble of almost all components, that's why I thought its easier (and cheaper) to by a 2TB fusion drive model for now and when warranty has expired, replace the fusion HDD with a SSD if that's possible. Don't need an external drive then (the largest internal SSD I can afford isn't large enough for all my data)

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Well... Yes, it's a bit more to pull the logic board up enough to plug the cable. But is it worth having a skimpy SSD (128 GB) vs going with a 512GB or if you can swing it a 1TB high speed NVMe x4 vs the much slower SATA III (6.0 Gb/s). It's not that hard once you get past getting the display off without killing it.

And don't forget you'll have a 2 TB HDD for the junk pile which you spent $250 for.

Again, wait on adding the second drive till the warranty has expired.

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