Here you can learn which settings you have to make on the Dell WYSE ZXoD (aka 7010) to be able to start the device with a UD pocket.
- Boot up the Dell device.
- In the BIOS go to the Advanced tab.
- Enable Boot From USB.
- Change to the Boot tab.
- Change the boot priority to make USB HDD the default by moving it to the top.
- Save the settings
- Put in the UD Pocket
See this video: