diff --git a/libburn/trunk/cdrskin/cdrskin.1 b/libburn/trunk/cdrskin/cdrskin.1
index 9fcfbdee..ff1ea56d 100644
--- a/libburn/trunk/cdrskin/cdrskin.1
+++ b/libburn/trunk/cdrskin/cdrskin.1
@@ -2,7 +2,7 @@
 .\" First parameter, NAME, should be all caps
 .\" Second parameter, SECTION, should be 1-8, maybe w/ subsection
 .\" other parameters are allowed: see man(7), man(1)
-.TH CDRSKIN 1 "Sep 10, 2009"
+.TH CDRSKIN 1 "Nov 15, 2009"
 .\" Please adjust this date whenever revising the manpage.
 .\"
 .\" Some roff macros, for reference:
@@ -899,6 +899,13 @@ Both, write_start_address and direct_write_amount size must be aligned to a
 media dependend transaction size. With DVD-RAM, BD-RE, DVD+RW this is 2k, with
 overwriteable DVD-RW it is 32k.
 .TP
+.BI dvd_obs= default|32k|64k
+Linux specific:
+Set the number of bytes to be transmitted with each write operation to DVD
+or BD media. A number of 64 KB may improve throughput with bus systems which
+show latency problems. The default depends on media type and option
+stream_recording= .
+.TP
 .BI fallback_program= command
 Set a command name to be executed if cdrskin encounters a known cdrecord
 option which it does not yet support. If a non-empty command is given with
@@ -1013,6 +1020,22 @@ which can only do DAO but not Incremental Streaming.
 .BI \--single_track
 Accept only the last argument of the command line as track source address.
 .TP
+.BI stdio_sync= on|off|number
+Set the number of bytes after which to force output to drives with prefix
+"stdio:". This forcing keeps the memory from being clogged with lots of
+pending data for slow devices. Default "on" is the same as "16m".
+Forced output can be disabled by "off".
+.TP
+.BI stream_recording= on|off|number
+By setting "on" request that compliance to the desired speed setting is
+preferred over management of write errors. With DVD-RAM and BD this can
+bring effective write speed near to the nominal write speed of the media.
+But it will also disable the automatic use of replacement blocks
+if write errors occur. It might as well be disliked or ignored by the drive.
+.br
+If a number is given, then error management stays enabled for all byte
+addresses below that number. Any number below 16s is the same as "off".
+.TP 
 .BI tao_to_sao_tsize= size
 Set an exact fixed size for the next track to be in effect only if the track
 source cannot deliver a size prediction and no tsize= was specified and an
@@ -1199,17 +1222,6 @@ Linux specific:
 Use and report literal Bus,Target,Lun addresses rather than real SCSI and
 pseudo ATA addresses. This method is outdated and was never compatible with
 original cdrecord.
-.TP
-.BI stream_recording="on"|"off"|number
-By setting "on" request that compliance to the desired speed setting is
-preferred over management of write errors. With DVD-RAM and BD this can
-bring effective write speed near to the nominal write speed of the media.
-But it will also disable the automatic use of replacement blocks
-if write errors occur. It might as well be disliked or ignored by the drive.
-.br
-If a number is given, then error management stays enabled for all byte
-addresses below that number. Any number below 16s is the same as "off".
-.TP 
 .BI --xa1-ignore
 Silently interpret option -xa1 as -data. This may be necessary if a frontent
 does not prepare -xa1 block headers but insists in using option -xa1.
diff --git a/libburn/trunk/cdrskin/cdrskin.c b/libburn/trunk/cdrskin/cdrskin.c
index 8f9a5a2c..e1accad1 100644
--- a/libburn/trunk/cdrskin/cdrskin.c
+++ b/libburn/trunk/cdrskin/cdrskin.c
@@ -148,6 +148,10 @@ or
    Move them down to Cdrskin_libburn_from_pykix_svN on version leap
 */
 
+/* burn_write_opts_set_dvd_obs() and burn_write_opts_set_stdio_fsync()
+*/
+#define Cdrskin_libburn_has_fsync_obS 1
+
 #endif /* Cdrskin_libburn_0_7_3 */
 
 #ifndef Cdrskin_libburn_versioN
@@ -2695,6 +2699,11 @@ set_dev:;
      printf(
          " --drive_scsi_exclusive  try to exclusively reserve device files\n");
      printf("                    /dev/srN, /dev/scdM, /dev/stK of drive.\n");
+#ifdef Cdrskin_libburn_has_fsync_obS
+     printf(" dvd_obs=\"default\"|number\n");
+     printf(
+     "                    set number of bytes per DVD/BD write: 32k or 64k\n");
+#endif
 #ifdef Cdrskin_burn_drive_eject_brokeN
      printf(
           " eject_device=<path>  set the device address for command eject\n");
@@ -2745,6 +2754,13 @@ set_dev:;
      printf(
          "                    byte addresses below that number.\n");
 #endif
+#ifdef Cdrskin_libburn_has_fsync_obS
+     printf(" stdio_sync=\"default\"|\"off\"|number\n");
+     printf(
+     "                    set number of bytes after which to force output\n");
+     printf(
+     "                    to drives with prefix \"stdio:\".\n");
+#endif
 
 #ifdef Cdrskin_allow_libburn_taO
      printf(
@@ -3191,6 +3207,8 @@ struct CdrskiN {
  int dummy_mode;
  int force_is_set;
  int stream_recording_is_set; /* see burn_write_opts_set_stream_recording() */
+ int dvd_obs;                 /* DVD write chunk size: 0, 32k or 64k */
+ int stdio_sync;              /* stdio fsync interval: -1, 0, >=32 */
  int single_track;
  int prodvd_cli_compatible;
 
@@ -3409,6 +3427,8 @@ int Cdrskin_new(struct CdrskiN **skin, struct CdrpreskiN *preskin, int flag)
  o->dummy_mode= 0;
  o->force_is_set= 0;
  o->stream_recording_is_set= 0;
+ o->dvd_obs= 0;
+ o->stdio_sync= 0;
  o->single_track= 0;
  o->prodvd_cli_compatible= 0;
  o->do_devices= 0;
@@ -6951,6 +6971,10 @@ burn_failed:;
 #ifdef Cdrskin_libburn_has_stream_recordinG
  burn_write_opts_set_stream_recording(o, skin->stream_recording_is_set);
 #endif
+#ifdef Cdrskin_libburn_has_fsync_obS
+ burn_write_opts_set_dvd_obs(o, skin->dvd_obs);
+ burn_write_opts_set_stdio_fsync(o, skin->stdio_sync);
+#endif     
 
  if(skin->dummy_mode) {
    fprintf(stderr,
@@ -7825,6 +7849,22 @@ set_driveropts:;
    } else if(strcmp(argv[i],"-dummy")==0) {
      skin->dummy_mode= 1;
 
+   } else if(strncmp(argv[i], "-dvd_obs=", 9)==0) {
+     value_pt= argv[i] + 9;
+     goto dvd_obs;
+   } else if(strncmp(argv[i], "dvd_obs=", 8)==0) {
+     value_pt= argv[i] + 8;
+dvd_obs:;
+     if(strcmp(value_pt, "default") == 0)
+       num= 0;
+     else
+       num = Scanf_io_size(value_pt,0);
+     if(num != 0 && num != 32768 && num != 65536) {
+       fprintf(stderr,
+       "cdrskin: SORRY : Option dvd_obs= accepts only sizes 0, 32k, 64k\n");
+     } else
+       skin->dvd_obs= num;
+
    } else if(strcmp(argv[i],"-eject")==0) {
      skin->do_eject= 1;
      if(skin->verbosity>=Cdrskin_verbose_cmD)
@@ -8215,6 +8255,26 @@ set_speed:;
      if(skin->verbosity>=Cdrskin_verbose_cmD)
        ClN(printf("cdrskin: speed : %f\n",skin->x_speed));
 
+   } else if(strncmp(argv[i], "-stdio_sync=", 12)==0) {
+     value_pt= argv[i] + 12;
+     goto stdio_sync;
+   } else if(strncmp(argv[i], "stdio_sync=", 11)==0) {
+     value_pt= argv[i] + 11;
+stdio_sync:;
+     if(strcmp(value_pt, "default") == 0 || strcmp(value_pt, "on") == 0)
+       num= 0;
+     else if(strcmp(value_pt, "off") == 0)
+       num= -1;
+     else
+       num = Scanf_io_size(value_pt,0);
+     if(num > 0)
+       num/= 2048;
+     if(num != -1 && num != 0 && (num < 32 || num > 512 * 1024)) {
+       fprintf(stderr,
+ "cdrskin: SORRY : Option stdio_sync= accepts only sizes -1, 0, 32k ... 1g\n");
+     } else
+       skin->stdio_sync= num;
+
    } else if(strncmp(argv[i],"-stream_recording=",18)==0) {
      value_pt= argv[i]+18;
      goto set_stream_recording;
diff --git a/libburn/trunk/cdrskin/cdrskin_timestamp.h b/libburn/trunk/cdrskin/cdrskin_timestamp.h
index ab8d348d..f94eafbd 100644
--- a/libburn/trunk/cdrskin/cdrskin_timestamp.h
+++ b/libburn/trunk/cdrskin/cdrskin_timestamp.h
@@ -1 +1 @@
-#define Cdrskin_timestamP "2009.11.15.153140"
+#define Cdrskin_timestamP "2009.11.15.165016"