I have 2 physical drives drives in my computer, C and D. Recently D "disappeared" and I assumed that it had stopped working but never removed it. I then mapped the letter D: to network share. Later the physical drive "reappeared" and when I navigate to D this is the drive I see. However the operating system also thinks that it's mapped to a network share and shows a red X next to the drive letter indicating that it can't reach that share but I can still navigate to the physical drive there.
How do I unmap this drive letter?