Make sure this is the disk you want to change (might be disk1, disk2, etc). This shows the MBR version (which Windows uses): fdisk /dev/disk0 ![]() ![]() The above shows the GPT version (which OSX uses). This happens if you try to partition your Mac disk from Windows. What has likely happened is that the two partition tables, the GPT and the MBR, have gone out of sync. If both versions of diskutil fail here too, stay in the installation media's terminal and get the raw partition table using: gpt -r show disk0 ![]() Have you tried booting from OSX installation media? Those have both a Terminal (with diskutil) and the GUI Disk Utility, which might start working as you're no longer trying to partition the drive you're booting from.Ĭaution, from now on: here be dragons! Make sure you understand what's going on before you start on this, you can't back out halfway! Check your backups are readable!
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