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In cases like this booting off another source and running repair utilities like TechTool, DiskWarrior, or Drive Genius was the only thing that repaired the problem short of reformatting said drive or partition & reinstalling the OS. The most common issue I found when a Mac refuses to boot of any partition is corrupted permissions (I don’t mean just one or two, but thousands of system files with incorrect permissions so many that even Disk Utility is powerless to fix) and/or corrupt directory files (again, beyond Disk Utility’s ability to repair/replace). ![]() As a technician myself, I can say that in less that 25% of the cases where I encountered this issue was it a case of failing hardware. Know of another method of fixing broken EFI partitions? Have any related tips or thoughts that are helpful? Let us know in the comments!īoth TechTool Pro & DiskWarrior can deal with this without the need to blow away the partition. If the drive is failing, you will need to replace it, and you’d want to do that sooner than later to avoid data loss. If you suspect that may be the case, you may want to attempt to repair the drive through Disk Utility and run Apple Hardware Test on the Mac to see if any hardware related disk errors appear. #CLOVER EFI MAC OSX HIGH SEIRRA MAC OS#If you go a route aside from simply reinstalling Mac OS X, you may lose data.įinally, something else to keep in mind is that sometimes damaged or broken EFI partitions can be an indicator of an impending disk failure, or some other problem with the hard drive. In other words, no personal data, files, or apps should be lost in the process if all you are choosing to do is reinstall Mac OS X. #CLOVER EFI MAC OSX HIGH SEIRRA MAC OS X#
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