Mac os base system3/8/2023 I picked 'Macintosh HD', clicked 'First Aid', nothing showed to fix. Most of them where able to either erase or re-install the system, but I'm at a dead end, as I don't have any of these options available. I ran Command + R and clicked Disk Utility. macOS 10.13 (High Sierra) September 25, 2017: macOS High Sierra adds a new video standard called HEIC and a transition to Apple File System (APFS), which is an improved alternative to its predecessor file system HFS+.Apart from that, there are a few enhancements in Safari, Mail, and Photo but nothing major. ![]() I've researched on the internet and a lot of people made this mistake. ![]() How to reinstall macOS while in Recovery mode. This disk is also locked, so I cannot re-install High Sierra (see picture 3).Īs the OS X Base System is the only thing left in the computer, every time I start it up, it does directly into the Recovery menu. If youre running macOS High Sierra or later on a Mac with an SSD, your choices will be some form of APFS. In the Disk Utility, the options for erase, restore and unmount are all unavailable (see picture 2), I imagine that's because you normally cannot do any of these on the OS X Base System disk. This new disk image cannot be partitioned: when I hit the + sign in the partition screen, nothing happens. Hi! I had problems with my iMac and tried to erase the OS and re-install, but I did something wrong and now all I have is asingle partition with OS X Base System that is the size of my HD (1 TB), see picture 1.
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