title: How to unmount drive in Google Colab and remount to another drive?
body: <p>I mounted to Google drive account A. Now I want to switch to account B but I cannot do that, because there is no way for me to enter a new authentication key when executing <code>drive.mount()</code>.</p>
  <p>What I have tried and failed:</p>
  <ol>
  <li>restart browser, restart computer</li>
  <li>use <code>force_remount=True</code> in <code>drive.mount()</code>, it will only automatically remount account A. Not asking me for new mounting target.</li>
  <li>change account A password</li>
  <li>change run-time type from GPU to None and back to GPU</li>
  <li>open everything in incognito mode</li>
  <li>sign out all google accounts</li>
  </ol>
  <p>How  can I:</p>
  <ul>
  <li>forget previous authentication key so it will ask me for a new one?</li>
  <li>dismount drive and forget previous authentication key?</li>
  </ul>