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Apple Computing Products:
macOS - Apps and Programs
Creating a Bootable USB Installer for macOS Catalina
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<blockquote data-quote="Rod" data-source="post: 1834320" data-attributes="member: 204485"><p>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.</p><p>I did download the installer again from the Software Update site as my saved installer was prior to the supplemental updates.</p><p></p><p>Now I wanted to create a Bootable USB Installer for Catalina. 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. He does warn that the app needs to be given System Accessibility in Security and Privacy preferences. </p><p>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. This was a blank 32Gb USB thumb drive formatted as Macintosh OS Extended (Journaled).</p><p></p><p>Not to be daunted I though I would use Terminal instead. 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.</p><p></p><p>About to give up at this point I read a couple of other unhelpful hits on the topic until I came to this one; <a href="https://www.macworld.com/article/3442597/how-to-create-a-bootable-macos-catalina-installer-drive.html" target="_blank">How to create a bootable macOS Catalina installer drive | Macworld</a></p><p>This just seemed too easy. Download "Instal Disk Creator"(Free) and run it according to it's simple, intuitive instructions and "Bob's your Uncle"!</p><p>No System Access settings, just pick the source and the destination and click Create Installer. Thats it!</p><p>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. Disk Utility does work and as expected shows two Macintosh HD's.</p><p></p><p>Someone might like to give this a try <strong>assuming they have backups and are not using their primary device</strong>. Until then I can only assume it works until proven otherwise.</p></blockquote><p></p>
[QUOTE="Rod, post: 1834320, member: 204485"] 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. I did download the installer again from the Software Update site as my saved installer was prior to the supplemental updates. Now I wanted to create a Bootable USB Installer for Catalina. 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. He does warn that the app needs to be given System Accessibility in Security and Privacy preferences. 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. This was a blank 32Gb USB thumb drive formatted as Macintosh OS Extended (Journaled). Not to be daunted I though I would use Terminal instead. 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. About to give up at this point I read a couple of other unhelpful hits on the topic until I came to this one; [url=https://www.macworld.com/article/3442597/how-to-create-a-bootable-macos-catalina-installer-drive.html]How to create a bootable macOS Catalina installer drive | Macworld[/url] This just seemed too easy. Download "Instal Disk Creator"(Free) and run it according to it's simple, intuitive instructions and "Bob's your Uncle"! No System Access settings, just pick the source and the destination and click Create Installer. Thats it! 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. Disk Utility does work and as expected shows two Macintosh HD's. Someone might like to give this a try [B]assuming they have backups and are not using their primary device[/B]. Until then I can only assume it works until proven otherwise. [/QUOTE]
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Creating a Bootable USB Installer for macOS Catalina
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