diff --git a/libisoburn/trunk/xorriso/xorriso.1 b/libisoburn/trunk/xorriso/xorriso.1
index bdc24dda..05c1107d 100644
--- a/libisoburn/trunk/xorriso/xorriso.1
+++ b/libisoburn/trunk/xorriso/xorriso.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 XORRISO 1 "Feb 14, 2010"
+.TH XORRISO 1 "Feb 17, 2010"
 .\" Please adjust this date whenever revising the manpage.
 .\"
 .\" Some roff macros, for reference:
@@ -3158,6 +3158,15 @@ Record format is: timestamp start_lba size volume-id
 .br
 The first three items are single words, the rest of the line is the volume id.
 .TP
+\fB\-scsi_log\fR "on"|"off"
+Mode "on" enables very verbous logging of SCSI commands and drive replies.
+Logging messages get printed to stderr, not to any of the xorriso output
+channels.
+.br
+A special property of this option is that the first -scsi_log setting
+among the start arguments is in effect already when the first operations
+of xorriso begin. Only "-scsi_log" with dash "-" is recognized that way.
+.TP
 \fB\-end\fR
 .br
 End program immediately
diff --git a/libisoburn/trunk/xorriso/xorriso.c b/libisoburn/trunk/xorriso/xorriso.c
index 818f6da6..9f96ac81 100644
--- a/libisoburn/trunk/xorriso/xorriso.c
+++ b/libisoburn/trunk/xorriso/xorriso.c
@@ -4868,6 +4868,7 @@ int Xorriso_new(struct XorrisO ** xorriso,char *progname, int flag)
  }
  m->msglist_stackfill= 0;
  m->status_history_max= Xorriso_status_history_maX;
+ m->scsi_log= 0;
  strcpy(m->report_about_text, "UPDATE");
  Xorriso__text_to_sev(m->report_about_text, &m->report_about_severity, 0);
  m->library_msg_direct_print= 0;
@@ -7126,6 +7127,11 @@ int Xorriso_status(struct XorrisO *xorriso, char *filter, FILE *fp, int flag)
  if(!(is_default && no_defaults))
    Xorriso_status_result(xorriso,filter,fp,flag&2);
 
+ is_default= (xorriso->scsi_log == 0);
+ sprintf(line,"-scsi_log %s\n", xorriso->scsi_log ? "on" : "off");
+ if(!(is_default && no_defaults))
+   Xorriso_status_result(xorriso,filter,fp,flag&2);
+
  is_default= (xorriso->session_logfile[0]==0);
  sprintf(line,"-session_log %s\n",
          Text_shellsafe(xorriso->session_logfile,sfe,0));
@@ -16448,6 +16454,8 @@ int Xorriso_option_help(struct XorrisO *xorriso, int flag)
 "  -session_log path",
 "              Set path of a file where a log record gets appended after",
 "              each session. Form: timestamp start_lba size volume-id", 
+"  -scsi_log \"on\"|\"off\"",
+"              Enable or disable logging of SCSI commands to stderr.",
 "  # any text  Is ignored. In dialog mode the input line will be stored in",
 "              the eventual readline history, nevertheless.", 
 "  -version    Tell program and version number",
@@ -18200,6 +18208,23 @@ int Xorriso_option_scdbackup_tag(struct XorrisO *xorriso, char *listname,
 }
 
 
+/* Option -scsi_log */
+int Xorriso_option_scsi_log(struct XorrisO *xorriso, char *mode, int flag)
+{
+ if(strcmp(mode, "on") == 0)
+   xorriso->scsi_log= 1;
+ else if(strcmp(mode, "off") == 0)
+   xorriso->scsi_log= 0;
+ else {
+   sprintf(xorriso->info_text, "-scsi_log: unknown mode '%s'", mode);
+   Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "FAILURE", 0);
+   return(0);
+ }
+ Xorriso_scsi_log(xorriso, !!xorriso->scsi_log);
+ return(1);
+}
+
+
 /* Option -session_log */
 int Xorriso_option_session_log(struct XorrisO *xorriso, char *path, int flag)
 {
@@ -19381,7 +19406,7 @@ int Xorriso_count_args(struct XorrisO *xorriso, int argc, char **argv,
     "options_from_file","osirrox","outdev","out_charset","overwrite",
     "pacifier","padding","path_list","pathspecs","pkt_output","print","prompt",
     "prog","prog_help","publisher","quoted_not_list","quoted_path_list",
-    "reassure","report_about","rom_toc_scan",
+    "reassure","report_about","rom_toc_scan","scsi_log",
     "session_log","speed","split_size","status","status_history_max",
     "stdio_sync","stream_recording","system_id","temp_mem_limit",
     "uid","unregister_filter","use_readline","volid","volset_id",
@@ -20090,6 +20115,10 @@ next_command:;
    (*idx)+= 2;
    ret= Xorriso_option_scdbackup_tag(xorriso, arg1, arg2, 0);
  
+ } else if(strcmp(cmd, "scsi_log") == 0) {
+   (*idx)++;
+   ret= Xorriso_option_scsi_log(xorriso, arg1, 0);
+
  } else if(strcmp(cmd,"session_log")==0) {
    (*idx)++;
    ret= Xorriso_option_session_log(xorriso, arg1, 0);
@@ -20466,19 +20495,19 @@ protect_stdout:;
      sprintf(xorriso->info_text, "Disabling use of libreadline.");
      Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "NOTE", 0);
 
-   } else if(strcmp(cmd,"abort_on")==0 && was_dashed) {
+   } else if(strcmp(cmd,"abort_on")==0 && was_dashed == 1) {
      i++;
      if(!was_abort_on)
        Xorriso_option_abort_on(xorriso, arg1, 0);
      was_abort_on= 1;
 
-   } else if(strcmp(cmd,"report_about")==0 && was_dashed) {
+   } else if(strcmp(cmd,"report_about")==0 && was_dashed == 1) {
      i++;
      if(!was_report_about)
        Xorriso_option_report_about(xorriso, arg1, 0);
      was_report_about= 1;
 
-   } else if(strcmp(cmd,"return_with")==0 && was_dashed) {
+   } else if(strcmp(cmd,"return_with")==0 && was_dashed == 1) {
      i+= 2;
      num2= 0;
      sscanf(arg2,"%d",&num2);
@@ -20486,7 +20515,7 @@ protect_stdout:;
        Xorriso_option_return_with(xorriso, arg1, num2, 0);
      was_return_with= 1;
 
-   } else if(strcmp(cmd,"as")==0 && was_dashed) {
+   } else if(strcmp(cmd,"as")==0 && was_dashed == 1) {
      if(strcmp(arg1, "mkisofs")==0 || strcmp(arg1, "genisoimage")==0 ||
         strcmp(arg1, "genisofs")==0 || strcmp(arg1, "xorrisofs")==0)
        goto protect_stdout;
@@ -20498,6 +20527,10 @@ protect_stdout:;
      if(ret <= 0)
        goto ex;
 
+   } else if(strcmp(cmd, "scsi_log") == 0 && was_dashed == 1) {
+     i++;
+     Xorriso_option_scsi_log(xorriso, arg1, 0);
+
    } else {
      ret= Xorriso_count_args(xorriso, argc-i, argv+i, &arg_count, 1);
      if(ret==1)
diff --git a/libisoburn/trunk/xorriso/xorriso.h b/libisoburn/trunk/xorriso/xorriso.h
index 49549bbe..2596ecf6 100644
--- a/libisoburn/trunk/xorriso/xorriso.h
+++ b/libisoburn/trunk/xorriso/xorriso.h
@@ -887,6 +887,8 @@ int Xorriso_option_rom_toc_scan(struct XorrisO *xorriso, char *mode,
 /* Option -scdbackup_tag */
 int Xorriso_option_scdbackup_tag(struct XorrisO *xorriso, char *list_path,
                                  char *record_name, int flag);
+/* Option -scsi_log */
+int Xorriso_option_scsi_log(struct XorrisO *xorriso, char *mode, int flag);
 
 /* Option -session_log */
 int Xorriso_option_session_log(struct XorrisO *xorriso, char *path, int flag);
diff --git a/libisoburn/trunk/xorriso/xorriso_private.h b/libisoburn/trunk/xorriso/xorriso_private.h
index 5eda8cad..1b1edd26 100644
--- a/libisoburn/trunk/xorriso/xorriso_private.h
+++ b/libisoburn/trunk/xorriso/xorriso_private.h
@@ -368,6 +368,8 @@ struct XorrisO { /* the global context of xorriso */
 
  int status_history_max; /* for -status long_history */
  
+ /* 0= no logging of SCSI commands, 1= to stderr */
+ int scsi_log;
 
  char report_about_text[20];
  int report_about_severity;
diff --git a/libisoburn/trunk/xorriso/xorriso_timestamp.h b/libisoburn/trunk/xorriso/xorriso_timestamp.h
index f0426344..6d40f7b7 100644
--- a/libisoburn/trunk/xorriso/xorriso_timestamp.h
+++ b/libisoburn/trunk/xorriso/xorriso_timestamp.h
@@ -1 +1 @@
-#define Xorriso_timestamP "2010.02.17.140002"
+#define Xorriso_timestamP "2010.02.18.125019"
diff --git a/libisoburn/trunk/xorriso/xorrisoburn.c b/libisoburn/trunk/xorriso/xorrisoburn.c
index 585e8027..a6d32e4a 100644
--- a/libisoburn/trunk/xorriso/xorrisoburn.c
+++ b/libisoburn/trunk/xorriso/xorrisoburn.c
@@ -13014,3 +13014,13 @@ int Xorriso_set_change_pending(struct XorrisO *xorriso, int flag)
  return(1);
 }
 
+
+/* @param flag bit0= enable SCSI command logging to stderr */
+int Xorriso_scsi_log(struct XorrisO *xorriso, int flag)
+{
+ if(flag == 0)
+   burn_set_scsi_logging(0);
+ else
+   burn_set_scsi_logging(2|4);
+ return(1);
+}
diff --git a/libisoburn/trunk/xorriso/xorrisoburn.h b/libisoburn/trunk/xorriso/xorrisoburn.h
index 3af3b3d8..5f24027c 100644
--- a/libisoburn/trunk/xorriso/xorrisoburn.h
+++ b/libisoburn/trunk/xorriso/xorrisoburn.h
@@ -488,6 +488,10 @@ int Xorriso_pvd_info(struct XorrisO *xorriso, int flag);
 /* @param flag bit0= do not set hln_change_pending */
 int Xorriso_set_change_pending(struct XorrisO *xorriso, int flag);
 
+/* @param flag bit0= enable SCSI command logging to stderr */
+int Xorriso_scsi_log(struct XorrisO *xorriso, int flag);
+
+
 
 /* A pseudo file type for El-Torito bootsectors as in man 2 stat :
    For now take the highest possible value.