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apple_set_os.efi suddenly boots into macOS  

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(@tobias_gerhardsson)
New Member
Joined: 2 months ago
Posts: 3
February 12, 2019 9:06 am  

I installed Windows 8.1 yesterday through Bootcamp on my late 2013 MacBook Pro 13", 2,4 GHz Intel Core i5 with the eGPU setup consisting of Radeon Nitro+ RX 580 8GB with Akitio Node. I used apple_set_os.efi successfully yesterday by putting it according to the instructions on a USB drive. I was able to boot into Windows by selecting the apple_set_os.efi drive when holding ALT upon starting the computer.

Now, one day later, I suddenly can't boot into Windows using the apple_set_os.efi drive. When I select the drive, it boots up macOS instead. I haven't done any updates of the OS on either Windows or Mac since yesterday. The only thing I've done is that I formatted an external drive in Windows 8.1, but that disk is not connected right now.

Another difference from yesterday is that I now have two disks labeled "WINDOWS" in the boot window after pressing ALT upon starting the computer. The first disk looks like it did yesterday, it's a grey "internal" icon. The second disk that I didn't see yesterday is an orange "external" icon. Any idea why this is? I can't see any other disks in the Disk Utility on Mac.

Has anyone encountered this before and know what to do?

This is how the disks look in Windows. I'm seeing some strange "ghost disks" in there, but maybe that's normal? Could there be some kind of temporary partition that's been created?

https://imgur.com/a/HVwSXHz

This topic was modified 2 months ago

Pending: Add my system information and expected eGPU configuration to my signature to give context to my posts


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(@tobias_gerhardsson)
New Member
Joined: 2 months ago
Posts: 3
February 12, 2019 10:08 am  

Solution

I tried fixing this by setting the Windows partition as the startup disk. The partition was not visible in the Startup Disk settings on macOS however, so I ended up booting up holding ALT on startup and then clicked the arrow beneath the original Windows partition (the one with the grey internal icon) while holding CTRL. That's a workaround for selecting the disk as the default startup disk.

That fixed it! If I select the apple_set_os.efi drive now on startup, it boots in Windows. Would love to have the apple_set_os.efi drive boot with Windows every time though as it seems like the start disk resets to macOS when I eventually boot there. So if you know how to set this up as good as possible I would appreciate some tips.

This post was modified 2 months ago

Pending: Add my system information and expected eGPU configuration to my signature to give context to my posts


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