So I just did a clean install of win10 from a usb. During the installation I split up the C: drive and created myself a d: partition. I normally do this when installing windows.

Now the install is complete, I see on both c: and d: full looking sets of files in programme files and windows.

I assume it boots from c: ? Is there a way to confirm this and delete the stuff on d:

thanks all. Not had call to ask a question round here in a long while.