About 1h30 later, it finally finished the installation and the system booted up successfully!ĭo not turn off or reboot the computer, even if the installation seems stuck. It quickly reached the same point: "less than a minute remaining." Just like the other attempts, I left it there for a while. Installation attempt: Monterey via external USB driver (2nd time).Īgain, I launched Monterey installation. So, as per the article above, I opened the Terminal and typed:Īfter a while, the two volumes were erased and the disk structure was recreated as APFS. How to fix a split Fusion Drive - Apple Support Indeed, it showed two local storage devices: A 2 TB HDD and a 128 GB SSD.Īpparently, the contents of the said SSD can be erased without any trouble, as they're supposed to be recreated again by the OS, automatically. So I rebooted the computer, booted from the external USB Monterey installation, and opened Disk Utility. See below:Īfter some research, I found out that in some cases, a Fusion Drive (hybrid HDD + SSD) can get split up and stop functioning as it should. ![]() "Storage system verify or repair failed (error 69716)" and no disk showing in the list of Startup Disks. I was starting to think that my HDD was defective. ![]() However, after a while, differently from the other attempts, the installation resulted in some errors that enabled me to dig deeper into the cause of the matter. I erased the HDD and checked it with Disk Utility's First Aid. This time, I could proceed with the installation. Installation attempt: Monterey via external USB driver. As I don't have any other pointing device, I had to give it up. However, I could't even try to install it, as it wouldn't connect to my Magic Mouse 2. This time, I tried to go back a few macOS versions and give Big Sur a try. Installation attempt: Big Sur via external USB driver. And all that after 4h of installation time. I erased my HDD (a 2 TB Fusion Drive) and formatted it as APFS (the recommended format.) However, this attempt wouldn't be any different from the first one: Installation stuck at some point, manual reboot, then stuck again. ![]() Installation attempt: Ventura via external bootable USB driver.Īfterwards, I created a bootable USB driver with the Ventura installer, as per Apple's instructions on the Support KB:Ĭreate a bootable installer for macOS - Apple Support But after quite a while, the installation failed and started showing a "question mark folder" during boot: Installation attempt: Internet Recovery Mode with Sierra.Īs the normal Recovery wouldn't load, I then tried the Internet Recovery (Opt + Cmd + R.) To my surprise, macOS Sierra was listed as installation choice (probably the one that shipped with iMac.) Anyway, I tried it. I then rebooted the machine, but whenever I tried the Recovery Mode, the screen would get stuck at the Apple logo. But after a whole night, the installation just wouldn't finish. I rebooted into local Recovery Mode (Cmd + R during boot) to reinstall macOS. Installation attempt: Ventura via Recovery Mode. After many attempts to log in, I decided to reinstall the system. After booting up again, it wouldn't go past the login window for any user: After the password, the loading bar would get stuck at half way, and after about 15 min the system would crash and reboot by itself. It was even impossible to reboot it from the Apple menu. Suddenly, after a fresh boot my macOS Ventura started to become very slow and hanging without any apparent reason. Many of them present some nonsensical, potentially harmful steps to take. I know there are tons of other articles and YouTube videos about this, but none of them was decisive in bringing me to the solution. ![]() Today I'd like to share some troubleshooting guidelines to help people having the same issue - as thoroughly reported in:īig Sur installation stuck at "Less than … - Apple Community I've recently faced the problem related to a macOS installation stuck at "less than a minute remaining" with a 27-in 2017 iMac, and it took me 2 days to finally sort it out.
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