I just cannot start it because the installation fails and something is still running, I guess. I already have a boot image on my USB drive. I would like to clean install OS X lion again. Is that disk2 the reason why I cannot partition my main HD? How can I unmount or erase that disk2 Mac OS X Base system ? So I tried using Terminal to force unmount that disk, but still it doesn't let me. However, if your Mac doesn't start up all the way, or you want to repair the disk your Mac starts up from, open Disk Utility from macOS Recovery: Apple silicon : Turn on your Mac and continue to press and hold the power button. I tried to unmount it or erase that disk2, but it won't let me. In general, you can just open Disk Utility from the Utilities folder of your Applications folder. gave this: Forced unmount of disk1 failed: at least one volume could not be unmounted Than for each disk: sudo diskutil unmount force disk1sn. As far as I know, I didn't see that disk2 in my disk list before. And then to unmount this: sudo diskutil unmountDisk force disk1. In Disk Utility, I found another disk called disk2 and Mac OS X Base System. But, when trying to partition, Disk Utility said that it cannot unmount the disk. So I tried to use Disk Utility to erase the startup disk and make a new partition. I tried to reinstall, but nothing came up. So, I tried to reboot again, but it said that the reinstallation failed and asked me to reinstall again. I don't have any Time Machine backups.Įverything went file, but in the middle of the installation, it got stuck, and later the installation failed without any reason. My Mac running Lion was being slow, so I was decided to reinstall OS X.
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