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. Visit this page and get clear cut idea on how to recover partition from external hard drive on Mac system.ix Problems Encountered during Repair of Map Partition. 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 ? Mac unmount disk how to Mac unmount disk mac os x Mac unmount disk software Mac unmount disk how to. That is, we could choose not to preempt system processes. Szukaem na google, ale nie znalazem nic, co by I could not execute step 3 (drive utility could not unmount disk) I could not execute step 3 (drive utility could not unmount disk). So I tried using Terminal to force unmount that disk, but still it doesn't let me. I too had this issue Mac Os Could Not Create A Preboot Volume For Apfs Install Site. I tried to unmount it or erase that disk2, but it won't let me. As far as I know, I didn't see that disk2 in my disk list before. 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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