Turn off the PC by holding power button until shutdown. Press the power button and keep pressing ESC until the startup menu appears. Press F9 to enter boot menu and choose you Windows installation media.
Once booted choose custom install and choose the new 1TB drive.
Now if you added another drive to the PC and want to initialize it, you need to go into Disk Manager. Press Win Key + X and choose Disk Manager and initialize the drive.
Hope it helps,
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