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Hello, I’d like to install Windows on my iMac. I have dual drive setup a PCIe connected SSD as Start-Up Disk (500 GB) and SATA connected HDD for storage needs. I’m using Boot Camp to install Windows and it asking me which disk to install it on. I’d like to install it in SATA connected HDD as it has more space (1TB), and also I do not want to put more load on the SSD. However I worry that there would be problems as Windows wouldn’t be in the same Start-Up Disk as MacOS. Has anyone done this before? How should I proceed?

The last time I setup BootCamp it needed to be installed on the boot drive. So if your SSD is your MacOS boot drive then it would need to be on it. But your applications and your Windows data could be located on a second drive. Depending on what you are running here you may just want to move your Mac data to your HDD and leave the SSD as your OS & Apps volume, leaving the rest of the drive empty (at least 1/4 of it) That way your system has space for virtual RAM, Caching & Page files and depending on the apps scratch space.