Larson Davis SoundAdvisor 831C Reference Manual page 82

SoundAdvisor Model 831C
Step 5
Examine the Data File Manager to confirm the desired action.
If the USB drive is removed during a measurement, the USB not available
TAKE NOTE
icon appears, the measurement ends, and data with that measurement is not
visible on the meter. When the USB drive is reinserted, the USB caution icon
appears. The meter notifies you that there is unsaved data and prompts you to
Save or Delete the measurement data. You cannot continue with the same
measurement.
Saving, Moving, or Copying Data Files 8-15