diff --git a/src/wx-config.c b/src/wx-config.c
index 2421d67..9f24e2c 100644
--- a/src/wx-config.c
+++ b/src/wx-config.c
@@ -1842,9 +1842,13 @@ static int hdnew_dlgproc(void* hdlg, int message, INT_PARAM wParam, LONG_PARAM l
                                                 return TRUE;
                                         }
                                 }
+                                wx_messagebox(hdlg, "Differencing VHD image created.\n\n"
+                                        "WARNING: Do not open or modify the parent image(s) while this file exists.", "PCem", WX_MB_OK);
+                        }
+                        if (hd_format != 3)
+                        {
+                                wx_messagebox(hdlg, "Drive created, remember to partition and format the new drive.", "PCem", WX_MB_OK);
                         }
-
-                        wx_messagebox(hdlg, "Drive created, remember to partition and format the new drive.", "PCem", WX_MB_OK);
 
                         wx_enddialog(hdlg, 1);
                         return TRUE;