Ask to unmount the disc via dbus/hal, although it isn't as much of a silver bullet as I wish. It unmounts discs from EFM fine, but Thunar isn't so compliant.

experimental/ecdb/trunk/src/ecdb_hal.h

@@ -4,6 +4,8 @@
 
 int   ecdb_hal_init(void);
 void  ecdb_hal_shutdown(void);
-void  ecdb_hal_request_unmount(Ecdb_Drive_Info *drive);
+void  ecdb_hal_request_unmount(Ecdb_Drive_Info *drive,
+                                                   E_DBus_Callback_Func cb,
+                                                   void *data);
 
 #endif