- Fixing a Broken EFI Partition on Mac.
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A few days ago, I tried installing Windows 8. While installing, my Mac recognized the boot drive as "EFI Boot" when I pressed the options key to select the boot drive.
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In the part when I had to format my partitions for installation, Windows created 2 partitions in the free space: The installation went well, no errors were raised, but when I pressed the options key at startup to boot to Windows, my Mac recognized my Windows partition as "EFI Boot" so now I have 3 options when I pressed the Options key: That is not really a big problem to me, but then when I started using Windows, I couldn't find a way to make the audio drivers working. I couldn't install Microsoft Office either. So, I booted into my Macintosh HD partition, and use disk utility to remove the Windows partition and the Microsoft Reserved partition.
Then, I reinstalled Windows 8. Boot camp install of Windows 7 issue, no bootable devices.
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Everything went well and the audio is now working, but now, when I press the Options key at startup, I have 4 options: Recovery Your PC needs to be repaired A required device isn't connected or can't be accessed. Press Enter to try again Press F8 for Startup settings. Apple, Boot, and Microsoft. I tried deleting the Microsoft folder and I kept the copy of it somewhere else , and boot into the EFI Boot again, my computer froze and restarted.
It's not creating any problems with my Mac or Windows partitions, but I'm very curious about what it actually is, what does it have to do with my computer, and why does it decide to show up when I pressed the options key? The rest of your question, which again is repeated below, does require further explanation.
This is part of the UEFI specification. For example, if you go to the " uefi. Sections 3.
Not all non-Apple operating systems do this when installing. For example, Ubuntu Linux does not.
Well, last time I installed in EFI mode it did not. Also, the copied grubx If you need to do this for two operating systems, then you will need a second EFI partition. I got the same problem here. Any idea? Maybe we should try running a windows 7 disk and then remove the partition from the windows 7 installer? EFI boot no longer tries to run Windows startup, it just boots to a black screen when selected. Any solutions? I even reformatted my hard drive and restored from a time machine backup and EFI boot showed up again. I was able to install Windows 10 without sound unfortunately by creating the partition o Disk Utility and then formatting it using the windows install partition creator.
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But now I have three entries on my boot loader, two for Windows and one for Sierra. I got my problems sorted out. Ran into a bunch of errors trying to use an external USB disc drive to install Windows.