You can indeed put Bootcamp Windows on an external SSD. I discovered this by searched for that sentence on Google (or roughly that). The how-to guy from 9-to-5 Mac has full directions on You Tube.

On your mac, use use the boot camp assistant to download just the support software to another USB stick. Copy the data on said stick to the Windows installer-stick you created earlier. Use the boot camp assistant to create a Windows installation stick (use another USB drive for this) and partition your Mac.

And the only cost seems to be Windows -- this one's about 10 Pro-- and the use of VMWare and a piece of freeware called, I think, Win2USB, something like that. It is tricky, in that there's a lot of steps, and you have to get them right. It took me two tries to get it going. But it will work. James Hassinger wrote: The Windows terms of use are a lot more flexible than they were. From in 2.b which states Device.

In this agreement, “device” means a hardware system (whether physical or virtual) with an internal storage device capable of running the software. A hardware partition or blade is considered to be a device. Under Enterprise or Education licenses, does allow a 'nomadic' installation. Hence it depends on what you original license is. James Hassinger wrote: Or I could but a 1 TB SSD and use iFixit to install. Consider another option.

Install macOS on an external disk, which is allowed under Apple's License, and dedicate the internal 1TB to Windows. In your current setup, or under this option, you have to carry an external disk with an OS, which can be either Windows or macOS, your choice. James Hassinger wrote: Now, I'm not sure how to proceed with installing Windows 10 on my normal boot drive. Is booting up into Macintosh HD, not Macintosh SSD, and using Bootcamp the only way? If you use the T5 SSD to boot from, the 2015 iMac will get confused. James Hassinger wrote: I don't have enough room for the partition I want.

I could erase the drive, install a minimal Mac partition, and then use bootcamp to do it. Any suggestions? Yes, I would also recommend the same method. Install the same version of macOS again (do not switch to a higher version) which is minimal. Do not reduce the macOS partition to be smaller than the size of the SSD part in your Mac. I suggest leaving about 250GB on the HDD aside as part of macOS. The reason is the SSD part is 120GB, so we leave 2 x 120 + overhead on the HDD, in case the SSD fails.

This leaves about 750Gb for Windows on a 1TB HDD, or 1.75TB on a 2TB HDD. If you have a 3TB HDD, I recommend slightly over 1TB of the HDD be left for macOS.

I have a 1 TB Fusion drive on my 2015 iMac, and it’s rather full. I wanted to use a fast SSD, and the Samsung T5 is very fast. I knew it would be hard to move, but I am using it to work from home. Seemed to me rather obvious.

The Windows terms of use are a lot more flexible than they were, and this demo shows that first, you virtualize it, you add the Bootcamp drivers, and reinstall the thing to the external with Win2USB, A regular.exe from a solid Windows thing. Or I could but a 1 TB SSD and use iFixit to install. Facebook for mac computer.

James Hassinger wrote: The Windows terms of use are a lot more flexible than they were. From in 2.b which states Device. In this agreement, “device” means a hardware system (whether physical or virtual) with an internal storage device capable of running the software. A hardware partition or blade is considered to be a device.

Under Enterprise or Education licenses, does allow a 'nomadic' installation. Hence it depends on what you original license is. James Hassinger wrote: Or I could but a 1 TB SSD and use iFixit to install. Consider another option. Install macOS on an external disk, which is allowed under Apple's License, and dedicate the internal 1TB to Windows.

In your current setup, or under this option, you have to carry an external disk with an OS, which can be either Windows or macOS, your choice. After two sessions with Microsoft and Apple Support, I decided to take your advice. I bought a 1 TB Samsung T5, and cloned my Fusion drive to it. It boots up perfectly, and is many times faster than the Fusion.

Now, I'm not sure how to proceed with installing Windows 10 on my normal boot drive. Is booting up into Macintosh HD, not Macintosh SSD, and using Bootcamp the only way? I don't have enough room for the partition I want.

I could erase the drive, install a minimal Mac partition, and then use bootcamp to do it. Any suggestions? James Hassinger wrote: Now, I'm not sure how to proceed with installing Windows 10 on my normal boot drive. Is booting up into Macintosh HD, not Macintosh SSD, and using Bootcamp the only way?