My beloved 2017 iMac recently crashed – the hard drive died. The machine ran OS Catalina 10.15.7 which is the last OS that supports iBooks Author, the fantastic discontinued Apple program which makes all my published books. What to do? The new silicon chips won’t support Catalina.
My local Vancouver BC Apple shop took it in and their tech support pulled out the failed SSD from the iMac, attached a larger, very fast Kingston 1TB PCIe 4.0 SSD in a Satechi Enclosure to the back of the iMac (strapped to the stand), installed OS Catalina on the new drive, migrated my data from my Time Machine backup. Voila! My iMac runs much faster now with the latest SSD. The hard drive is doubled in size. I still have the beautiful 27inch 5K Apple screen and the cost was low! $369 Canadian [US $271]