Index: /trunk/src/VBox/Frontends/VirtualBox/src/medium/UIMediumDetailsWidget.cpp
===================================================================
--- /trunk/src/VBox/Frontends/VirtualBox/src/medium/UIMediumDetailsWidget.cpp	(revision 68329)
+++ /trunk/src/VBox/Frontends/VirtualBox/src/medium/UIMediumDetailsWidget.cpp	(revision 68330)
@@ -693,6 +693,7 @@
 //                                               .arg(m_oldData.m_options.m_strDescription).arg(m_newData.m_options.m_strDescription));
     if (!pWidget || pWidget == m_pErrorPaneSize)
-        m_pErrorPaneSize->setToolTip(tr("Cannot change medium size from <b>%1</b> to <b>%2</b> as storage shrinking is currently forbidden.")
-                                         .arg(m_oldData.m_options.m_uLogicalSize).arg(m_newData.m_options.m_uLogicalSize));
+        m_pErrorPaneSize->setToolTip(tr("Cannot change medium size from <b>%1</b> to <b>%2</b> as storage shrinking is currently not implemented.")
+                                        .arg(vboxGlobal().formatSize(m_oldData.m_options.m_uLogicalSize))
+                                        .arg(vboxGlobal().formatSize(m_newData.m_options.m_uLogicalSize)));
 }