diff --git a/Makefile.am b/Makefile.am
index e348bcc9..9450a3bc 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -52,7 +52,8 @@ bin_PROGRAMS = \
 xorriso_xorriso_CPPFLAGS = -Ilibisoburn
 xorriso_xorriso_CFLAGS = -DXorriso_with_maiN \
                          $(READLINE_DEF) $(LIBACL_DEF) $(XATTR_DEF) \
-                         $(EXTF_DEF) $(EXTF_SUID_DEF) $(ZLIB_DEF)
+                         $(EXTF_DEF) $(EXTF_SUID_DEF) $(ZLIB_DEF) \
+                         $(XORRISO_DVD_OBS_64K)
 
 xorriso_xorriso_LDADD = libisoburn/libisoburn.la -lisofs -lburn \
 		$(THREAD_LIBS) $(LIBBURN_ARCH_LIBS)
diff --git a/configure.ac b/configure.ac
index 4ea8163e..704280a0 100644
--- a/configure.ac
+++ b/configure.ac
@@ -196,6 +196,18 @@ else
 fi
 AC_SUBST(EXTF_SUID_DEF)
 
+AC_ARG_ENABLE(dvd-obs-64k,
+[  --enable-dvd-obs-64k            64 KB default size for xorriso DVD/BD writing, default=no],
+               , enable_fifo_odirect=no)
+if test x$enable_dvd_obs_64k = xyes; then
+    XORRISO_DVD_OBS_64K="-DXorriso_dvd_obs_default_64K"
+    echo "enabled  xorriso write size default 64 KB on DVD and BD"
+else
+    XORRISO_DVD_OBS_64K=
+    echo "disabled xorriso write size default 64 KB on DVD and BD"
+fi
+AC_SUBST(XORRISO_DVD_OBS_64K)
+
 
 AC_CHECK_HEADER(libburn/libburn.h)
 AC_CHECK_HEADER(libisofs/libisofs.h)
diff --git a/xorriso/configure_ac.txt b/xorriso/configure_ac.txt
index bf23675e..8f8b8acb 100644
--- a/xorriso/configure_ac.txt
+++ b/xorriso/configure_ac.txt
@@ -204,6 +204,17 @@ else
 fi
 AC_SUBST(EXTF_SUID_DEF)
 
+AC_ARG_ENABLE(dvd-obs-64k,
+[  --enable-dvd-obs-64k            64 KB default size for DVD/BD writing, default=no],
+               , enable_fifo_odirect=no)
+if test x$enable_dvd_obs_64k = xyes; then
+    XORRISO_DVD_OBS_64K="-DXorriso_dvd_obs_default_64K"
+    echo "enabled  xorriso write size default 64 KB on DVD and BD"
+else
+    XORRISO_DVD_OBS_64K=
+    echo "disabled xorriso write size default 64 KB on DVD and BD"
+fi
+AC_SUBST(XORRISO_DVD_OBS_64K)
 
 
 AC_CONFIG_FILES([
diff --git a/xorriso/makefile_libxorriso_am.txt b/xorriso/makefile_libxorriso_am.txt
index 06e96685..f613876f 100644
--- a/xorriso/makefile_libxorriso_am.txt
+++ b/xorriso/makefile_libxorriso_am.txt
@@ -70,7 +70,8 @@ bin_PROGRAMS = \
 xorriso_xorriso_CPPFLAGS = -Ilibisoburn
 xorriso_xorriso_CFLAGS = -DXorriso_with_maiN -DXorriso_without_subS \
                          $(READLINE_DEF) $(LIBACL_DEF) $(XATTR_DEF) \
-                         $(EXTF_DEF) $(EXTF_SUID_DEF) $(ZLIB_DEF)
+                         $(EXTF_DEF) $(EXTF_SUID_DEF) $(ZLIB_DEF) \
+                         $(XORRISO_DVD_OBS_64K)
 
 xorriso_xorriso_LDADD = libisoburn/libisoburn.la -lisofs -lburn \
                         libxorriso/libxorriso.la \
diff --git a/xorriso/xorriso_timestamp.h b/xorriso/xorriso_timestamp.h
index b4d72e75..668c2d62 100644
--- a/xorriso/xorriso_timestamp.h
+++ b/xorriso/xorriso_timestamp.h
@@ -1 +1 @@
-#define Xorriso_timestamP "2009.11.17.134239"
+#define Xorriso_timestamP "2009.11.17.142447"