diff --git a/src/calibre/devices/usbms/books.py b/src/calibre/devices/usbms/books.py
index 1ddc00729f..50756ef3ee 100644
--- a/src/calibre/devices/usbms/books.py
+++ b/src/calibre/devices/usbms/books.py
@@ -49,7 +49,7 @@ class Book(object):
     @property
     def db_id(self):
         '''The database id in the application database that this file corresponds to'''
-        match = re.search(r'_(\d+)$', self.rpath.rpartition('.')[0])
+        match = re.search(r'_(\d+)$', self.path.rpartition('.')[0])
         if match:
             return int(match.group(1))
 
diff --git a/src/calibre/gui2/library.py b/src/calibre/gui2/library.py
index 90dc3eb1ea..0ee5f36a59 100644
--- a/src/calibre/gui2/library.py
+++ b/src/calibre/gui2/library.py
@@ -778,6 +778,12 @@ class BooksModel(QAbstractTableModel):
                 return self.bool_blank_icon
             return self.bool_no_icon
 
+        def ondevice_decorator(r, idx=-1):
+            text = self.db.data[r][idx]
+            if text:
+                return self.bool_yes_icon
+            return self.bool_blank_icon
+
         def text_type(r, mult=False, idx=-1):
             text = self.db.data[r][idx]
             if text and mult:
@@ -810,7 +816,11 @@ class BooksModel(QAbstractTableModel):
                    'ondevice' : functools.partial(text_type,
                                 idx=self.db.FIELD_MAP['ondevice'], mult=False),
                    }
-        self.dc_decorator = {}
+
+        self.dc_decorator = {
+                'ondevice':functools.partial(ondevice_decorator,
+                    idx=self.db.FIELD_MAP['ondevice']),
+                    }
 
         # Add the custom columns to the data converters
         for col in self.custom_columns:
diff --git a/src/calibre/gui2/ui.py b/src/calibre/gui2/ui.py
index 4f5e71174c..e97665909f 100644
--- a/src/calibre/gui2/ui.py
+++ b/src/calibre/gui2/ui.py
@@ -959,7 +959,7 @@ class Main(MainWindow, Ui_MainWindow, DeviceGUI):
                 self.status_bar.reset_info()
                 self.location_view.setCurrentIndex(self.location_view.model().index(0))
             self.eject_action.setEnabled(False)
-            self.refresh_ondevice_info (clear_info = True)
+            self.refresh_ondevice_info(clear_flags=True)
 
     def info_read(self, job):
         '''
@@ -1019,7 +1019,7 @@ class Main(MainWindow, Ui_MainWindow, DeviceGUI):
 
     ############################################################################
     ### Force the library view to refresh, taking into consideration books information
-    def refresh_ondevice_info(self, clear_flags = False):
+    def refresh_ondevice_info(self, clear_flags=False):
         self.book_on_device(None, reset=True)
         self.library_view.model().refresh()
     ############################################################################