diff --git a/instances/templates/edit_instance_volume.html b/instances/templates/instances/edit_instance_volume.html
similarity index 98%
rename from instances/templates/edit_instance_volume.html
rename to instances/templates/instances/edit_instance_volume.html
index ec0c3df..ff5fbdc 100644
--- a/instances/templates/edit_instance_volume.html
+++ b/instances/templates/instances/edit_instance_volume.html
@@ -121,7 +121,7 @@
                 <div class="clearfix"></div>
                 <div class="modal-footer">
                     <button type="button" class="btn btn-secondary" data-dismiss="modal">{% trans "Close" %}</button>
-                    <button type="submit" class="btn btn-success" name="edit_volume">{% trans "Save" %}</button>
+                    <button type="submit" class="btn btn-success" name="edit_volume" onclick="return confirm('{% trans "Are you sure to change volume properties?" %}')">{% trans "Save" %}</button>
                 </div><!-- /.modal-footer -->
 
             </div> <!-- /.modal-content -->
diff --git a/instances/templates/instances/settings_tab.html b/instances/templates/instances/settings_tab.html
index ef79a45..ddcf390 100644
--- a/instances/templates/instances/settings_tab.html
+++ b/instances/templates/instances/settings_tab.html
@@ -290,7 +290,7 @@
                                             <input type="hidden" name="dev" value="{{ disk.dev }}">
                                             <input type="hidden" name="storage" value="{{ disk.storage }}">
                                             <input type="hidden" name="name" value="{{ disk.image }}">
-                                            {% include 'edit_instance_volume.html' with id=forloop.counter0 %}
+                                            {% include 'instances/edit_instance_volume.html' with id=forloop.counter0 %}
                                         </form>
                                         <form class="d-inline" action="{% url 'instances:detach_vol' instance.id %}" method="post">
                                             {% csrf_token %}
diff --git a/instances/views.py b/instances/views.py
index 2fb3ab5..6669aa9 100644
--- a/instances/views.py
+++ b/instances/views.py
@@ -596,8 +596,8 @@ def edit_volume(request, pk):
         shareable = bool(request.POST.get("vol_shareable", False))
         readonly = bool(request.POST.get("vol_readonly", False))
         disk_type = request.POST.get("vol_type", "")
-        new_bus = request.POST.get("vol_bus", "")
         bus = request.POST.get("vol_bus_old", "")
+        new_bus = request.POST.get("vol_bus", bus)
         serial = request.POST.get("vol_serial", "")
         format = request.POST.get("vol_format", "")
         cache = request.POST.get("vol_cache", app_settings.INSTANCE_VOLUME_DEFAULT_CACHE)