Apple did not make things easy with AppleScript and using external disks with the last release of macOS, and Ive been unable to fix the bugs that prevent DiskMaker X to create a Catalina disk when already running Catalina (though it works quite well when running on Mojave). Well, the writing was on the wall for a while. I’ll keep experimenting, but right now I’m feeling bewildered and pretty hopeless.Īnyway thanks again for your suggestions. disk x maker about diskmaker x and macos big sur.
#Diskmaker x for big sur mac os x#
The iMac behaves as though it’s losing power during the boot process, or else after booted up, but that’s not really plausible (it’s connected to a UPS with other gear on it that keeps working fine). Discover new features for Maps and Messages Mojave Patcher NB: this version of DiskMaker X is not able to build a Mavericks installer from Mac OS X 10 Big Sur Beta 3 MB: Asus Z390-E RAM: 16GB DDR4 Corsair RGB SSD : Samsung Evo Plus Nvme x2 GPU : Radeon Pro WX 2100 WiFi : intel 9560 AC BT : Intel 9560 WiFi 2 : Asus AC-56 See more Big Sur Beta 3. Then I tried to boot into Recovery Mode… and it tried to do that… but then blacked out quickly again. Then I found a High Sierra (supposedly bootable) flash drive I’d prepared a while back… and it shows up as an option in the boot process… but then the iMac blacks out again before it even gets to the Apple logo.
#Diskmaker x for big sur install#
I can restart as often as I like (slowly), but it always crashes/blacks out after a few seconds or minutes either way. If you have an USB drive available larger than 4Gb (an 8Gb pen drive is perfect) then you can install the disk image on that which allows you to install Mac. The iMac seems normal for a little while, then blacks out again, no matter which internal boot volume I used. Choose the correct createinstallmedia command. What’s needed for a clean install on a Mac A backup of the disk before it’s erased. Now I’ve manually fixed the stupid error that started all this to begin with… and booted off both internal boot vols, and run Disk First Aid on both of them… and I’m still hosed. We will run through the following steps to create a bootable USB for Mac: Get the macOS installer files. macOS 12.0V12.3 macOS MontereyV12.3 macOS 10.16V11.6.5 macOS Big Sur. (2) I remembered that if you’re using a Microsoft keyboard (which I am), MacOS doesn’t have a chance to swap the startup keys until fairly late in the boot process, so I had to hold down what I think of as the “Command” key rather than the “Option” key to choose a boot volume.
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But I still couldn’t boot into it, until… (1) I remembered that I had (about a year ago) set up an alternative internal boot volume (on the same Fusion Drive). I was finally able to boot the iMac when I remembered a couple of things that I had forgotten: First of all, I’d like to thank everyone here for being so helpful and informative.