Replace Fusion Drive in 27" iMac

The Fusion Drive in my 27" iMac is becoming very slow. It is running macOS Ventura 13.7.1 and I wish to replace this with a faster SSD. Any suggestions?

iMac 27″ 5K, macOS 13.7

Posted on Jan 23, 2025 10:16 PM

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Question marked as Top-ranking reply

Posted on Jan 24, 2025 1:14 AM

Opening an Apple Computer, especially an iMac, will require special tools to get it open


It will also require some very special knowledge, by the user, to properly disconnect various cables within the computer


All this, before one gets to removing and replacing the SSD drive of this Fusion Drive


An alternative to extend the life of this machine


From another User Tip on running the computer entirely from an External SSD Drive


No opening of computer required


Use an external SSD as your startup disk … - Apple Community


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Feb 28, 2025 7:27 PM in response to Servant of Cats

Hi Servant of Cats,


Thanks so much for your advice. I like your second suggestion above. However, my 2017 iMac only has USB-A ports and an ethernet port on the back. Can I get an adaptor so one of these ports can become a USB-C / Thunderbolt port, to get the USB 3.1 Gen 2 speed? I've decided to go for the LaCie 2TB SSD. My Time Machine backups are on a 4TB external SSD.


Again, many thanks,

peterpatter.

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Mar 1, 2025 10:57 PM in response to Servant of Cats

Hi Servant of Cats,


Thanks so much for your information. As I've never, so far, had need for the USB3 ports, I had forgotten that they were there. How stupid can I be? To transfer files between my iMac and my MB Air (M1 chip), is a cable between the respective USB3 ports the best way of doing this?


At the moment both Macs are running OS Ventura. Is it necessary for them both to be on them same OS when transferring files via a cable, or wifi, or does this not matter?


By the way, based on information from you, and others, I will soon be purchasing a 2TB LaCie SSD to be my new startup drive.


Many thanks,

peterpatter.

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Mar 2, 2025 8:57 PM in response to peterpatter

Hi Servant of Cats,


It's me again. At my local Apple Store, the LaCie rugged 2TB SSD is indicated as being suitable for an iMac (Retina 5K, 27-inch, 2019–2020). As my iMac is a 2017 model, is it OK to go ahead with the purchase? The 2TB model costs quite a bit more than the 1TB SSD.


Many thanks,

peterpatter.


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Replace Fusion Drive in 27" iMac

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