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Mid 2012 model, A1278 / 2.5 GHz i5 or 2.9 GHz i7 processor.

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Bootable external drive not detected by startup manager

I have been trying to boot windows through mac 10.11.6 through startup manager since doing it through system preferences brings up the message no bootable drive error, but when I open startup manager it just brings up the laptops and a recovery drive I tried doing the command option p and r twice but still nothing I also tried to connect it once it is up but still nothing. I installed windows on the drive through a virtual machine running windows 10 and than wintousb to install windows 10 pro.

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Also when I boot up from my normal boot disk I have to disconnect than reconnect the hard drive so it can show up

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Follow this guide: Installing Windows 10 on a Mac without Bootcamp

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didn't help x as a command doesn't exist

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What are you looking for here: Command?

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step 5 under "Ensuring that a Hybrid MBR is not used" terminal doesn't recognize the command and doesn't have it listed when doing the "?" command

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