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Im struggling with this 2017 imac. This imac has a fusion drive which the mechanical drive was giving problems. I replaced it with another one to see if it would let me mount big sur again and I always have the same problem which is that I can't load macos. I'm not sure if the fusion ssd drive could have problems... any recommendations... thanks!!
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Hey Rick,
Now that I'm back from my trip (It got cancelled), I will try and assist you in this.
Firstly, have you installed an SSD in the imac (SATA or NVMe). If you haven't this is a good first step to try..
If you do so and this doesn't work, Reinstall Big sur/Monterey off a USB/EXT SSD (Must be above 32GB and recommend above 64 for headroom).
Hope this helps
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Hi nick, this is what I have done so far :
Replace the mecanical drive for another mechanical drive ( no results) I wonder if my issue could be the name that have as Fusion Drive?
What I did plan is to remove the ssd from the logicboard and let only the HD first to try and if works install a new 2.5 ssd.
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Ah! You've hit the Fusion Drive marriage problem! The hidden PCIe blade SSD is married to the original HDD which you've removed. Did you sign the divorce papers?? Nope! ;-}
You'll need to go into OS recovery to gain access to Disk Utility so you can properly break the linkage of the Blade SSD to its dead HDD mate!
Reformat the blade drive and make sure you've not added a partition. That should break the link - Your divorced!
Now the installer won't get confused. You could also do this using an external bootable OS installer or OS boot drive. But the newer MacOS's can make things harder with a standard bootable drive if you've encrypted your drive. And you could face loading an older recovery OS which doesn't understand what APFS is so it won't delete it.
Here's a resource to get older versions of macOS How to get old versions of macOS and here's how to make a bootable OS installer drive (32GB USB Thumb drive) How to create a bootable installer for macOS Which I find is faster and easier as you don't need to deal with recovery not loading the newer macOS the system is using (HFS+ Vs APFS confusion issues).
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JAJA! Nice one.Well the drive was having issues the main so i did put another one and reset the fusion drive and they are married again.But im still having the issue ( an error occurred applying the software update) Big sur
@gadgetboxrd - Sounds like you have a corruption. I would back up everything and break the Fusion drive set reformat both drives and if you are so inclined to have a Fusion Drive set re-establish it. Frankly I find people don't like to loss of performance using a dinky 24GB/128GB blade SSD's these systems had depending on the HD's size. Many people make the jump to a bigger and in some cases faster blade SSD OWC Aura Pro X2 SSD then running the system as a dual independent drive where the blade drive is the bootable OS drive and holds your apps, leaving a good portion as cache/scratch space and if large enough the active work piece.
I did that and reset the fusion with the new drive.I have the fusion install empty but won't install the system.On some point i did install macOS Catalina and when the mac boots you could the all in small size and with no wifi...is really strange what this machine is doing.On some point did show me some kernel panics and did reboot itself..i did think was the ram but is solder.I have apple oem ssd with 128gb because i did wonder if could be that the ssd is bad?
My main idea was to install a ssd on this machine and forget about the fusion drive.But i wonder if there is a tutorial on how to remove the fusion drive on this machine so i can install just a 2.5 ssd with good space...thanks for the help Dan.
@gadgetboxrd - Just follow this guide removing the blade SSD: iMac Intel 21.5" Retina 4K Display (2017) Blade SSD Replacement
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