diff --git a/xorriso/xorriso.c b/xorriso/xorriso.c
index 391b900b..3e276744 100644
--- a/xorriso/xorriso.c
+++ b/xorriso/xorriso.c
@@ -12474,22 +12474,31 @@ ex:;
 int Xorriso_report_md5_outcome(struct XorrisO *xorriso, char *severity,
                                int flag)
 {
- if((xorriso->find_check_md5_result & 3) == 0) {
+ int has_md5;
+
+ has_md5= Xorriso_image_has_md5(xorriso, 0);
+ if (has_md5 <= 0) {
    sprintf(xorriso->result_line,
-           "File contents and their MD5 checksums match.\n");
+           "There is no MD5 checksum array loaded.\n");
  } else if(xorriso->find_check_md5_result & 1) {
    sprintf(xorriso->result_line,
            "Mismatch detected between file contents and MD5 checksums.\n");
+ } else if(xorriso->find_check_md5_result & 8) {
+   sprintf(xorriso->result_line,
+           "File contents and their MD5 checksums match.\n");
+ } else {
+   sprintf(xorriso->result_line,
+           "Not a single file with MD5 checksum was found.\n");
  }
  Xorriso_result(xorriso,0);
  if(xorriso->find_check_md5_result & 2) {
    sprintf(xorriso->result_line,
-           "Encountered other errors during MD5 checking.\n");
+           "Encountered errors other than non-match during MD5 checking.\n");
    Xorriso_result(xorriso,0);
  }
- if(xorriso->find_check_md5_result & 4) {
+ if((xorriso->find_check_md5_result & 4) && has_md5) {
    sprintf(xorriso->result_line,
-    "There were data files which had no MD5 and thus could not be checked.\n");
+   "There were data files which have no MD5 and thus could not be checked.\n");
    Xorriso_result(xorriso,0);
  }
  if((xorriso->find_check_md5_result & 3) && strcmp(severity, "ALL") != 0) {
@@ -13346,19 +13355,17 @@ int Xorriso_option_check_md5(struct XorrisO *xorriso,
  struct FindjoB *job= NULL;
  double mem_lut= 0.0;
 
- if(!(flag&2)) {
-   Xorriso_pacifier_reset(xorriso, 0);
-   mem_lut= xorriso->last_update_time;
- }
- mem_pci= xorriso->pacifier_interval;
- xorriso->pacifier_interval= 5.0;
+ ret= Xorriso_opt_args(xorriso, "-check_md5", argc, argv, *idx + 1, 
+                       &end_idx, &optc, &optv, 128);
+ if(ret<=0)
+   goto ex;
 
  /* Interpret argv[*idx] as severity */
  if(argc <= *idx) {
    sprintf(xorriso->info_text,
            "-check_md5: No event severity given for case of mismatch");
    Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "FAILURE", 0);
-   return(0);
+   ret= 0; goto ex;
  }
  severity= argv[*idx];
  ret= Xorriso__text_to_sev(severity, &sev, 0);
@@ -13366,14 +13373,24 @@ int Xorriso_option_check_md5(struct XorrisO *xorriso,
    sprintf(xorriso->info_text, "-check_md5: Not a known severity name : ");
    Text_shellsafe(severity, xorriso->info_text, 1);
    Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "FAILURE", 0);
-   return(ret);
- }
- (*idx)++;
-
- ret= Xorriso_opt_args(xorriso, "-check_md5", argc, argv, *idx, 
-                       &end_idx, &optc, &optv, 128);
- if(ret<=0)
    goto ex;
+ }
+ ret= Xorriso_image_has_md5(xorriso, 0);
+ if(ret <= 0) {
+   sprintf(xorriso->info_text,
+           "-check_md5: There is no MD5 checksum array loaded.");
+   if (strcmp(severity, "ALL") == 0)
+       severity= "WARNING";
+   Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, severity, 0);
+   ret= -1; goto ex;
+ }
+
+ if(!(flag&2)) {
+   Xorriso_pacifier_reset(xorriso, 0);
+   mem_lut= xorriso->last_update_time;
+ }
+ mem_pci= xorriso->pacifier_interval;
+ xorriso->pacifier_interval= 5.0;
 
  xorriso->find_check_md5_result= 0;
 
@@ -13405,6 +13422,8 @@ int Xorriso_option_check_md5(struct XorrisO *xorriso,
        xorriso->find_check_md5_result|= 2;
      else if(ret == 0)
        xorriso->find_check_md5_result|= 1;
+     else if(ret == 1)
+       xorriso->find_check_md5_result|= 8;
      else if(ret == 2)
        xorriso->find_check_md5_result|= 4;
    }
diff --git a/xorriso/xorriso_timestamp.h b/xorriso/xorriso_timestamp.h
index ed36cd0b..1f6cd7bb 100644
--- a/xorriso/xorriso_timestamp.h
+++ b/xorriso/xorriso_timestamp.h
@@ -1 +1 @@
-#define Xorriso_timestamP "2009.08.12.202423"
+#define Xorriso_timestamP "2009.08.13.203718"
diff --git a/xorriso/xorrisoburn.c b/xorriso/xorrisoburn.c
index 8be7cf23..527bb2c6 100644
--- a/xorriso/xorrisoburn.c
+++ b/xorriso/xorrisoburn.c
@@ -1116,7 +1116,8 @@ int Xorriso_aquire_drive(struct XorrisO *xorriso, char *adr, int flag)
    goto ex;
 
  ext= isoburn_ropt_noiso1999;
- if((xorriso->ino_behavior & (1 | 2)) && !(xorriso->do_aaip & (1 | 4 | 32))) 
+ if((xorriso->ino_behavior & (1 | 2)) && !(xorriso->do_aaip & (1 | 4 | 32))
+    && !(xorriso->do_md5 & 1)) 
    ext|= isoburn_ropt_noaaip; 
  if(!(xorriso->do_aaip & 1)) 
    ext|= isoburn_ropt_noacl; 
@@ -7606,6 +7607,8 @@ int Xorriso_findi_action(struct XorrisO *xorriso, struct FindjoB *job,
      xorriso->find_check_md5_result|= 1;
    else if(ret < 0)
      xorriso->find_check_md5_result|= 2;
+   else if(ret == 1)
+     xorriso->find_check_md5_result|= 8;
    else if(ret == 2)
      xorriso->find_check_md5_result|= 4;
    if(ret >= 0)
@@ -8882,6 +8885,7 @@ int Xorriso_get_profile(struct XorrisO *xorriso, int *profile_number,
 }
 
 
+
 int Xorriso_iso_file_open(struct XorrisO *xorriso, char *pathname,
                           void *node_pt, void **stream, int flag)
 {
@@ -8889,7 +8893,7 @@ int Xorriso_iso_file_open(struct XorrisO *xorriso, char *pathname,
  char eff_path[SfileadrL];
  IsoNode *node= NULL;
  IsoFile *filenode= NULL;
- IsoStream *iso_stream= NULL;
+ IsoStream *iso_stream= NULL, *input_stream;
 
  *stream= NULL;
  if(flag&1) {
@@ -8915,6 +8919,15 @@ int Xorriso_iso_file_open(struct XorrisO *xorriso, char *pathname,
    Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "FAILURE", 0);
    return(0);
  }
+ if(flag & 2) {
+   /* Dig out the most original stream */
+   while(1) {
+     input_stream= iso_stream_get_input_stream(iso_stream, 0);
+     if(input_stream == NULL)
+   break;
+     iso_stream= input_stream;
+   }
+ }
  if(!iso_stream_is_repeatable(iso_stream)) {
    sprintf(xorriso->info_text,
            "The data production of the file in the image is one-time only");
@@ -12154,13 +12167,13 @@ int Xorriso_check_md5(struct XorrisO *xorriso, void *in_node, char *path,
  }
 
  /* Read file and compute MD5 */;
- ret= Xorriso_iso_file_open(xorriso, path, (void *) node, &stream, 1);
+ ret= Xorriso_iso_file_open(xorriso, path, (void *) node, &stream, 1 | 2);
  if(ret <= 0)
    {ret= -1; goto ex;}
  ret= iso_md5_start(&ctx);
  if(ret < 0)
      goto ex;
- todo= iso_file_get_size(file);
+ todo= iso_stream_get_size(stream);
  while(todo > 0) {
    if(todo < sizeof(buffer))
      wanted= todo;
@@ -12279,26 +12292,46 @@ int Xorriso_check_session_md5(struct XorrisO *xorriso, char *severity,
    Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "WARNING", 0);
    return(0);
  }
+
+ sprintf(xorriso->info_text, "Checking loaded session by its recorded MD5.\n"); 
+ Xorriso_info(xorriso, 0);
  for(i= 0; i < 16; i++)
    sprintf(md5_text + 2 * i, "%2.2x", ((unsigned char *) md5)[i]);
- sprintf(xorriso->info_text,
+ sprintf(xorriso->result_line,
          "Session MD5 %s , LBA %.f , %.f blocks\n",
          md5_text, (double) start_lba, (double) end_lba - start_lba);
- Xorriso_info(xorriso, 0);
+ Xorriso_result(xorriso,0);
  ret= Xorriso_check_md5_range(xorriso, (off_t) start_lba, (off_t) end_lba,
                               md5, 0);
  if(ret <= 0) {
-   sprintf(xorriso->result_line, "MD5 MISMATCH WITH DATA OF LOADED SESSION\n");
+   sprintf(xorriso->result_line,
+           "MD5 MISMATCH WITH DATA OF LOADED SESSION !\n");
    Xorriso_result(xorriso,0);
    if(strcmp(severity, "ALL") != 0) {
      sprintf(xorriso->info_text, "Event triggered by MD5 comparison mismatch");
      Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, severity, 0);
    }
  } else {
-   sprintf(xorriso->result_line, "md5 of session data matches recorded md5\n");
+   sprintf(xorriso->result_line, "Ok, session data match recorded md5.\n");
    Xorriso_result(xorriso,0);
  }
  return(ret);
 }
  
 
+int Xorriso_image_has_md5(struct XorrisO *xorriso, int flag)
+{
+ int ret;
+ IsoImage *image;
+ uint32_t start_lba, end_lba;
+ char md5[16];
+
+ ret= Xorriso_get_volume(xorriso, &image, 0);
+ if(ret<=0)
+   return(ret);
+ ret= iso_image_get_session_md5(image, &start_lba, &end_lba, md5, 0);
+ Xorriso_process_msg_queues(xorriso,0);
+ if(ret <= 0)
+   return(ret);
+ return(1);
+}
diff --git a/xorriso/xorrisoburn.h b/xorriso/xorrisoburn.h
index 0e1bb10b..3f8ad150 100644
--- a/xorriso/xorrisoburn.h
+++ b/xorriso/xorrisoburn.h
@@ -218,6 +218,7 @@ int Xorriso_get_profile(struct XorrisO *xorriso, int *profile_number,
                         char profile_name[80], int flag);
 
 /* @param flag bit0= node_pt is a valid ISO object handle, ignore pathname
+               bit1= dig out the most original stream for reading
 */
 int Xorriso_iso_file_open(struct XorrisO *xorriso, char *pathname,
                           void *node_pt, void **stream, int flag);
@@ -327,6 +328,8 @@ int Xorriso_check_md5(struct XorrisO *xorriso, void *in_node, char *path,
 int Xorriso_check_session_md5(struct XorrisO *xorriso, char *severity,
                               int flag);
 
+int Xorriso_image_has_md5(struct XorrisO *xorriso, int flag);
+
 
 struct CheckmediajoB {
  int use_dev;        /* 0= use indev , 1= use outdev , 2= use sector map*/