After finishing phone data extraction (you will see the text "Data extraction finished" in the white log panel) you can safely disconnect the phone from the PC.
If extracting from an Android phone please make sure that you uninstall the Forensic Connector application from the phone (this application is used for communication between the PC and the Android phone).
To uninstall Forensic Connector, please follow steps below:
Go to Settings / Applications
Select Forensic Connector from the list
Tap on Uninstall and confirm
If the phone is disconnected during the extraction process, you will get a 'Warning' message that the phone has been disconnected. You can either reconnect the phone to continue with the extraction or skip the extraction and continue with exports. Please note that if you do not complete the entire data extraction process the result will be incomplete phone data exports.