How do I install Windows 10 to an external drive?

I have an external LaCie Drive that I've partitioned 2 TB for an installation of Windows 10. I only have 1 TB of internal memory on my startup Mac so would like to use the external drive as a bootable Windows startup disk. I'm currently running High Sierra v10.13.5, on my iMac.

I've made it as far as creating the ISO image on a USB flash drive. Then Boot Camp Assistant only offers the option to quit.

Not sure where to go from here... 😕

iMac, macOS Sierra (10.12.1)

Posted on Jul 18, 2018 5:28 PM

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5 replies

Jul 18, 2018 5:31 PM in response to Brandon Hyatt

You don't. Microsoft doesn't allow that.

Jul 18, 2018 5:37 PM in response to Brandon Hyatt

Correct.

Jul 18, 2018 6:06 PM in response to Brandon Hyatt

Same restriction applies to installing Windows on a Windows PC.

Jul 18, 2018 5:35 PM in response to Allan Eckert

So the only way to have access to Windows is to do a partition on the internal hard drive? Really?

Loner T

Level 9

59,536 points

Jul 18, 2018 5:49 PM in response to Brandon Hyatt

Install macOS on the external drive, and use almost the entire disk space on the internal disk for Windows.

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How do I install Windows 10 to an external drive?