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Model A1419 / EMC 2806 / Late 2014 or Mid 2015. 3.3 or 3.5 GHz Core i5 or 4.0 GHz Core i7 (ID iMac15,1); EMC 2834 late 2015 / 3.3 or 3.5 GHz Core i5 or 4.0 GHz Core i7 (iMac17,1) All with Retina 5K displays

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How to Handle Fusion Drive After SSD Upgrade?

I have a l27” 5K Retina late-2015 iMac 17,1, originally with a 1TB Fusion Drive (1TB WD HDD plus 24GB Apple ‘blade’ SSD).

I’ve upgraded it by replacing the HDD with a 1TB OWC SSD. I haven’t done anything with the remaining 24GB “Fusion” element of the old Fusion Drive, as I figured it wasn’t really necessary.

I considered putting Boot Camp on it, but then realised that Boot Camp Assistant runs into all sorts of problems when it detects a ‘split’ Fusion Drive.

Not sure what the best course of action is; the way I see it, I can either:

# Rebuild the Fusion Drive, and have the 24GB PCIe SSD acting as a buffer for the 1TB SATA SSD

  1. Leave it as is, where it’s unformatted and doesn’t appear as a disk in Finder, and forget I have it…!
  2. Format the Blade SSD and have a semi-pointless (albeit quick) 24GB piece of storage.

Having it sat there doing nothing is kind of frustrating, but I’m not sure what the best thing to do with it is. Any advice?

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The 24 GB SSD is way too small to do anything with! When you had the HDD the SSD cache drive (Apple used larger ones before) offered enough speed improvement for most people.

Here it’s quite useless, as its too small to hold your OS and the virtual RAM, caching or scratch space the boot drive would also be used for. If you are using an app which allows you to alter which drive to use for scratch drive you could use it for that. You may find the apps and your work piece would need more than 24 GB (video or music production) to be useful.

While I realize your reasons on upgrading the HDD was the ease of access, the I/O limits of the SATA port 6.0 Gb/s Vs the faster PCIe/NVMe blade interface is now what you’re dealing with.

The better improvement would have been replacing the blade SSD with a much bigger SSD going with a 500 GB or 1 TB making it your boot drive with your apps and leaving at least 1/3 of the drive empty! Then have your HDD as your data drive. This dual drive setup is the ideal setup! Maybe that’s too big a jump for you here.

OK, going back to your two questions: I would leave it alone and just forget its there ;-}

You can’t use it with your SATA SSD as a cache drive (redoing the Fusion Drive) All you’ll do is make your system unstable and slow down your SATA based SSD performance.

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Much appreciated; I knew that replacing it with a much larger blade SSD would have been an overall larger performance boost, but it was pretty cost-prohibitive compared to the solution I went for in the end.

If it’ll negatively affect the experience using it as a fusion drive again, then I guess it can sit there as a prehensile reminder of what used to be….!

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Be happy you don't have this! Narwhal the 'Unicorn' Puppy maybe its a fly swisher ;-}

If you're all set don't forget to accept the answer.

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