In the "ODBC Driver" combobox you can specify or choose from the list the name of a JDBC/ODBC driver class, which you would like to be used to establish connection to an ODBC data source.
The default driver comming with Java:
     sun.jdbc.odbc.JdbcOdbcDriver
can always be selected, but you can specify or select also other ODBC Driver classes, which you have included in the Protégé class path.

Note: The most elegant way to include database drivers for DataMaster in your Protégé classpath is to place the .jar file containing your driver directly in the DataMaster plugin directory, located in
[PROTEGE_INSTALL_DIR]\plugins\edu.stanford.smi.protegex.datamaster
and restart Protégé.

For more information please refer to http://protegewiki.stanford.edu/index.php/DataMaster