Notes on disabling pad when USB mouse is plugged in

How To Turn Off Touchpad When Mouse Is Connected In Windows 10/7/8.1

Earlier this year, I talked about configuring Mac OS X to automatically disable the trackpad when a mouse is connected to the MacBook. This feature comes in handy for those users who always use a mouse and don’t want to use the built-in trackpad after connecting the mouse.
In Windows operating system, a graphical option to automatically turn off the touchpad when a mouse is connected can be found under Mouse Properties in Control Panel. In addition to that, if you’re running Windows 8.1 with the recently released August Update, you can now configure Windows 8.1 to automatically turn off the touchpad when a mouse is connected to your netbook or notebook right from PC settings.
If you’re using a notebook or netbook equipped with ELAN or Synaptics touchpad, an option labelled Disable internal pointing device when a mouse is connected should appear under Mouse Properties.\
Following are the steps you need to follow in order to automatically disable touchpad when a mouse is connected in Windows 10, 8/8.1 and Windows 7.

Turn off touchpad when mouse is connected using Control Panel

Method 1 of 4
For Windows 10
Step 1: Open Settings, click Devices icon and then click Mouse & touchpad.
Step 2: Under Touchpad section, turn off the option labelled Leave touchpad on when a mouse is connected.
Method 2 of 4
(This method should work fine on Windows 10, Windows 7, and Windows 8/8.1)
Step 1: Open Control Panel by navigating to Start menu and then clicking Control Panel.
Step 2: Change the default View to Small icons. Look for the entry named Mouse and click on the same to open Mouse Properties.
Step 3: Switch to the ELAN or Device Settings tab and look for an option titled Disable when external USB pointing device plug in or Disable internal pointing device when external USB pointing device is attached. Check the same option and then click Apply button. That’s it!
If the above option isn’t present and you’re laptop is using Synaptics touchpad, you can try out the given below instructions to see the above mentioned option.
Method 3 of 4
NOTE: We recommend you create a backup of Registry before changing default entries.
Step 1: Open Registry Editor. To do so, open Run command by simultaneously pressing Windows + R keys, type Regedit.exe in the field followed by enter key.
Click on the Yes button when you see the UAC prompt.
Step 2: In the Registry Editor, navigate to the following key:
HKEY_LOCAL_MACHINE\SOFTWARE\Synaptics\SynTPEnh
Step 3: On the right-side, create a new DWORD value and rename it as DisableIntPDFeature. Finally, change its value to 33 (make sure that Hexdecimal is selected under Base section).
Step 4: Close the Registry Editor and reboot your PC to see Disable internal pointing device when external USB pointing device is connected option. Good luck!
Method 4 of 4
Disable touchpad when mouse is connected in Windows 8.1
Step 1: Open PC settings. To do so, move the mouse cursor to the upper or lower right corner of the screen to see the Charms bar, click Settings and then click Change PC settings option.
Step 2: On the left-pane of PC settings, click PC and devices, and then click Mouse and touchpad.
Step 3: Here, on the right-side, look for the option titled Leave touchpad on when a mouse is connected and turn off the same to automatically turn off the touchpad when you connect a mouse to your Windows 8.1 notebook or netbook. That’s it!