artie,

Also I have a back-up of Mojave. I am trying to boot up from that back-up but I get...SDErrorDomain error 104

I need to retrieve some info from Mojave. Any ideas?

jaybass

OS 13.6.6 iMac (Retina 5K, 27", 2017, 3.4 GHz Intel Core i5, 24 GB RAM, 2400 MHz DDR4. SuperDuper. 1 TB Lacie HD