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I followed these instructions (Is it possible to use Boot Camp with Windows 10 from an external HDD?) to install Windows 10 to my external SSD (Samsung T3). I followed Alex Lambert's guide (the one with most upvotes & correct answer), and was able to install and boot Windows 10 successfully.

I ran to a problem today, as I was connecting the drive to another Mac I have until I noticed that my drive was not being seen from the boot menu (option key), although I could see both of my drives (my drives are partitioned in half: 250GB for Windows (NTFS) and 250GB for Data for both OSes, Windows and OS X (exFAT)) in OS X on the other computer.

Please help!

Thanks.

Jack
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1 Answers1

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The general rule is that the 2015 and newer Macs can no longer boot operating systems using the BIOS method. This is the method used in the installation instructions you refer to. Also, generally 2011 and older Macs can not boot Windows from external drives. Therefore, the installation method, you refer to, generally only works for the 2012 through 2014 model year Mac computers.

But even if both computers qualify to BIOS boot Windows from external drives, you have the problem of the drivers. One of the steps, in the instruction you refer to, is to install the Boot Camp Support Software. This software installs the correct drives for your model Mac. If you then try to boot Windows using a different model Mac, the installed drivers will be wrong for the this Mac.

David Anderson
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