When I tried the Catalina install I had made on that external drive it did not boot when the option key was pressed so I decided to try again in case I had skipped a step. Net result, - Mojave clone erased entirely. I created the necessary space using Disk Utility and must have gotten a bit careless and selected the wrong drive. I've done that many times in other OS versions with no issues. In essence, the drive would have had a Mojave clone and Catalina clone on the same drive. My thought was to split my Mojave drive into two partitions and place a clean Catalina installation on the blank area I created on that drive. That's what I was trying to correct.Īs for the loss of data and loss of my Mojave partition, that was not the fault of CCC.
Until then I can only assume it works until proven otherwise.Ĭlick to expand.I'm not sure how a CCC clone behaves when one tries to boot using the Option key method. Someone might like to give this a try assuming they have backups and are not using their primary device. Disk Utility does work and as expected shows two Macintosh HD's. I have booted from the USB and all seems as it should but I cannot test the macOS installer as I only have the one device. No System Access settings, just pick the source and the destination and click Create Installer. Download "Instal Disk Creator"(Free) and run it according to it's simple, intuitive instructions and "Bob's your Uncle"! I found the appropriate sudo command at OSX Daily and tried that but Terminal refused to recognise the command despite careful cutting and pasting with the name of the USB drive inserted where instructed.Ībout to give up at this point I read a couple of other unhelpful hits on the topic until I came to this one How to create a bootable macOS Catalina installer drive | Macworld Not to be daunted I though I would use Terminal instead. This was a blank 32Gb USB thumb drive formatted as Macintosh OS Extended (Journaled). Having followed the instructions I attempted to run the app but for some reason despite a number of attempts it could not see the USB drive plugged into my MBP. He does warn that the app needs to be given System Accessibility in Security and Privacy preferences. I checked the Diskmaker X site and found that although still under development there is a Diskmaker X 9 version which should be capable of the task according to the developer. Now I wanted to create a Bootable USB Installer for Catalina. I did download the installer again from the Software Update site as my saved installer was prior to the supplemental updates. So now that the public release (plus updates) of Catalina is here and currently running on my MBP I tackled the process again on my wife's 2018 MBPr and all went without a hitch I'm pleased to report.
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