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How to Disable MacBook Trackpad when mouse is connected?

OS X offers an option to ignore built-in trackpad when mouse or wireless trackpad is connected.

  1. Open System Preferences.
  2. Click on Accessibility.
  3. Click on Mouse & Trackpad on left panel.
  4. Check on “Ignore built-in trackpad when mouse or wireless rackpad is present”.
  5. Close Accessibility window.

How to Disable MacBook Trackpad when mouse is connected