diff --git a/devices/__init__.py b/devices/__init__.py
--- a/devices/__init__.py
+++ b/devices/__init__.py
@@ -18,9 +18,9 @@ def get_storage_devices(removable=None, 
         result = json.loads(result.decode('utf'))
         rval = []
         for device in result['blockdevices']:
-            if removable and device['rm'] == '0':
+            if removable and (device['rm'] == '0' or device['rm'] is False):
                 continue
-            if removable == 'False' and device['rm'] == '1':
+            if removable == 'False' and (device['rm'] == '1' or device['rm'] is True):
                 continue
             if device_type is not None and device['type'] != device_type:
                 continue
diff --git a/forms/mainwindow.py b/forms/mainwindow.py
--- a/forms/mainwindow.py
+++ b/forms/mainwindow.py
@@ -71,10 +71,11 @@ class MainWindow(Ui_MainWindow, QtWidget
         os.makedirs(self.root, exist_ok=True)
 
         self.devices_model = CustomListModel()
+        self.table_model = CustomTableModel('(Not set)')
+
         self.devices_combobox.setModel(self.devices_model)
         self.refresh_disk_drives()
 
-        self.table_model = CustomTableModel('(Not set)')
         self.tableView.setModel(self.table_model)
         self.refresh_image_list()