How to upgrade iMac 2019 from fusion HDD to SSD (4k) - YouTube
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27 inch iMac 2019 Fusion Drive upgrade | MacRumors Forums
Apple iMac with 27in Retina 5K display (2TB Fusion Drive, Intel Core i5 9th Gen. 4.60 GHz, 8GB) Gray - MRR12LL/A (March, 2019)
Upgrading a 27-inch iMac 5K to 14 terabytes - Replacing the Fusion Drive with both a SSD and an harddisk