Follow the steps below to create a macOS bootable installer. ![]() ![]() Clicking the mounting action does noting.Creating a bootable installer is very easy, and there are a variety of methods to do so. The disk is showed in Disk Utility as MacOS extended with GUID Partition Map, but is greyed out (not mounted). Initialized /dev/rdisk2s2 as a 7 GB case-insensitive HFS Plus volume with a 8192k journalĮven trying to mount it from the CLI bring a failure without any further information. Disk Utility claims it cannot mount the volume at the end of the formatting phase:Įrasing “Generic4 Flash Disk Media” (disk2) and creating “Untitled”įormatting disk2s2 as Mac OS Extended (Journaled) with name Untitled I took a third one and formatted it as MacOS Extended (Journaled) with the Scheme " GUID Partition Map". Regarding the formatting of the USB drive. When I download twice the installer from the AppleStore and the size twice exactly the same, then I assume, that the download was successful. ![]() Delete your install application, then download it again from the App Store." "Sorry, your macOS Install app may be incomplete. Which format should be chosen for the volume to be recognised and mounted ?ĭiskmakerx still does recognise the downloaded installer as complete. Which of course leads the drive not to be made available for the system. As this is in fact the source of my problem and I am certainly not the only one in this case.Īt the end of the Formatting process, the following error is thrown out: Nevertheless I would be interested in understanding why an external drive formatted as MacOS extended won't mount on my Mac. Not sure, that this error is correct as I had no problem while downloading the installer. I tried diskmakerx, but it claims the High Sierra installer I download is incomplete. But i n fact it would be sufficient for me to be able to create the bootable installer, even if I cannot boot my newer Mac from it - what I do not plan to do at all in fact. That's the reason why I am trying to load HighSierra on the usb drive., which is the last supported MacOS for it.īut the Mac that makes me problem is the one I am using to create the bootable installer. The Mac I want to boot from the external drive is an older one (Mid2010) and will certainly don't have that T2 security chip. Thank you for your quick reply and this information. 40 years ago I was a wiz with DOS but it has been slowly downhill since with it all a bit less intuitive for me. Thank you for in advance for your patience and help, it really is much appreciated. Ultimately the 2011 will go to wife or daughter with my other 500 gig Samsung SSD that currently has a time machine backup on it. So, I would like to install High Sierra on the 2011 so the drive of the 2011 so it could be my external drive on the 2019 the latest OS compatible. Can I make a bootdrive on a flashdrive on the 2019 for High Sierra and then be able to erase the disk in the 2011 and get rid of the APFS file error problem? So I attempted to erase the disc and that failed because I was booted up to it. I downloaded High Sierra and attempted to install it but the install failed because of the APFS file error message: could not create Preboot.APFS. I had been running OS El Capitan on the 2011 and had planned to remove the harddrive and use it as an external drive on the 2019 MBP but learned that it would have to run High Sierra for that to work and High Sierra is the latest OS a 2011 will run. ![]() I am trying to load High Sierra on my late 2011 Macbook Pro, which has a non factory Samsung 500 gig SSD. Failed High Sierra Install on Late 2011 MacBook Pro I am communicating with you on my brand new 2019 model Macbook Pro 16, running Catalina.
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