You may have an old adware infection imported by Migration Assistant: How to fix a split Fusion Drive - Apple Support I have tried reinstalling the system, but that doesn't help.Īdvice to reinstall the OS on a Fusion Drive system often creates issues. The external USB/SSD drive is slower the the original Fusion setup That also could explain the slowdown you describe. Those are the expected speeds when you boot from an external SATA 6G SSD in a USB3 enclosure, which is what you have. That Fusion configuration when working will deliver Write speeds of 600-900MB/sec and Reads of up to 2000MB/sec based on drive speed data I've collected. And the speeds reported indicate that you are booting off your WD external SSD. Your iMac appears to have shipped with Apple's Fusion (hybrid) drive, but the critical software connection between the two physical components of the drive-a 28GB NVME solid-date drive and a 7200 RPM SATA 6 mech hard drive-has been lost ,resulting in a "split" drive.
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