Input Devices come in many categories including the mouse, Optical Mouse, Trackball, Touchpad/Pointing Stick, Stylus, Styli, Light Pen, and Digitizer. The mouse can be referred to as Mechanical or ball, and utilizes a small rubber ball inside to transmit a spatial relationship between objects on the screen.
Input Devices It contained moving parts, the ball mouse was prone to dirt build up inside. Hairs would often get caught and rolled into the ball mechanism, causing the mouse to function erratically. The optical mouse uses a light-emitting diode and photodiodes to detect movement relative to the underlying surface, rather than moving some of its parts like the traditional trackball that detects movement of X and Y-axis. In order to increase the precision of the mouse, multiple infrared lasers with the increasing resolution are used.
The Trackball has a platform that is stable and does not move. The ball is on the top side, the user moves the ball with their fingers or thumb. In many ways this can be much more accurate then a standard mouse and requires less space than a mouse as it does not require extra room for movement, so it is the built-in pointing devices on some laptops. It was also used by Blackberry in some of their early smart phones. The best solution for using a mouse on a laptop is to get a real mouse. Now you can readily use a desktop computer mouse on your laptop instead of or along with the touch pad. Yes, it’s one more thing to carry.There’s no need to disable the mouse pad when you use an external mouse.