How to Choose a Coffee Machine For Pods The pod machines read the barcode that is located on the top of each pod (which is a disc of pre-dosed, sealed ground coffee that is pressed between layers of filter paper). It is easy to insert it and push a button. https://coffeee-uk71798.59bloggers.com/28746160/what-the-10-most-worst-best-pod-coffee-machine-failures-of-all-time-could-have-been-prevented