The rest of your question, which again is repeated below, does require further explanation. This a duplicate of the question " Ghost partition, Windows BSOD". The question is, how can I make the EFI Boot disappear when I press the options key at startup? The question is, how can I make the EFI Boot disappear when I press the options key at startup? 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? 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. When I tried mounting the EFI partition, I see 3 folders: Apple, Boot, and Microsoft. When I tried pressing Enter and F8 keys, it returned to the same blue screen. When I tried choosing "EFI Boot", it shows me a blue screen, saying:Ī required device isn't connected or can't be accessed. Then, I reinstalled Windows 8.1 by following these instructions: Boot camp install of Windows 7 issue, no bootable devicesĮverything went well and the audio is now working, but now, when I press the Options key at startup, I have 4 options: Macintosh HD, Windows, EFI Boot, and Recovery. So, I booted into my Macintosh HD partition, and use disk utility to remove the Windows partition and the Microsoft Reserved partition. I couldn't install Microsoft Office either. 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. 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:Macintosh HD, EFI Boot, and Recovery). the partition where Windows is meant to be installed. In the part when I had to format my partitions for installation, Windows created 2 partitions in the free space: 1. While installing, my Mac recognized the boot drive as "EFI Boot" (when I pressed the options key to select the boot drive). A few days ago, I tried installing Windows 8.1 on my late 2011 Mac by using disk utility to make a free space on my disk and a Windows 8.1 boot drive to install.
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