Mark_Lawrence :
Have ONLY the drive you will use for the C connected. (the SSD?)
Install the OS
Later, then connect the HDD
Sorry i'm noob, dont know this can be done. Thanks for the info tho, but is it not possible to put in both the ssd and hdd at the same time them choose where the OS should be installed from these two?
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Yes, but...
What happens is, Windows in its infinite wisdom, generally puts the boot partition on the
second drive.
You tell it to install to the SSD, and it installs the OS on the SSD. And the boot partition ends up on the HDD. You have no control over that, except by not having that drive present during the install.
6 months from now, when you want to use that HDD elsewhere, you take it out.
And then this PC does not boot up.
You can have it physically installed, just leave the power and data connection cables disconnected until after.