In case there is a long pause when you are performing recovery, there is no need to worry. The entire disk creation also entails a lot of error checking. Therefore, the computer might stop for about 30 minutes before it starts to work. Do not worry! Once the process is complete you will see the progress bar in action again. This will allow the system act in a more proper manner. If the problem persists, there might an issue with the external disk. To that end, use a new one and reinitialize the entire recovery disk creation process again. If the problem still persists, you should promptly Contact HP Support Ireland.