Following the manuals and hitting a roadblock on set up. I'm not seeing a USR for the CR300 either in Device Config Utility or Loggernet. Image size is adequately small.
CR300 is not able to configure a USR drive(not enough RAM).
You will need to write images to CPU drive instead. The CPU drive on the CR300 has a lot more endurance than the CPU drive on older loggers, so frequently saving images to it is not a concern.