diff --git a/libisoburn/trunk/src/libisoburn.h b/libisoburn/trunk/src/libisoburn.h
index 00c2e8fd..02870d99 100644
--- a/libisoburn/trunk/src/libisoburn.h
+++ b/libisoburn/trunk/src/libisoburn.h
@@ -217,21 +217,31 @@ int isoburn_get_min_start_byte(struct burn_drive *d, off_t *start_byte,
                                int flag);
 
 
-/** Prepare a disc for writing the new session.
-    @param drive The target drive
-    @param disc A burn_disc suitable to pass to isoburn_disc_write().
+/** Create a disc object for writing the new session from the created or loaded
+    iso_volset which has been manipulated via libisofs, to the same media from
+    where the image was eventually loaded. This struct burn_disc is ready for
+    use by a subsequent call to isoburn_disc_write().
+    After this asynchronous writing has ended and the drive is BURN_DRIVE_IDLE
+    again, the burn_disc object has to be disposed by burn_disc_free().
+    @param drive The combined source and target drive, grabbed with
+                 isoburn_drive_scan_and_grab(). .
+    @param disc Returns the newly created burn_disc object.
     @return <=0 error , 1 = success
 */
 int isoburn_prepare_disc(struct burn_drive *d, struct burn_disc **disc,
                          struct isoburn_source_opts *opts);
 
 
-/** Prepare a disc for creating a new image from the contents of a previous
-    image volset plus the changes made by user. The generated burn_disc is
-    suitable to be written to any libburn drive. You shouldn't use the same
-    drive you're using as source.
+/** Create a disc object for producing a new image from a previous image
+    plus the changes made by user. The generated burn_disc is suitable
+    to be written to any other libburn drive. You must not use the same drive
+    for writing as you are using here as source, because data will be
+    read from the source drive while the target drive gets written to.
+    The resulting burn_disc object has to be disposed when all its writing
+    is done and the drive is BURN_DRIVE_IDLE again after asynchronous
+    burn_disc_write().
     @param d The source drive, grabbed with isoburn_drive_scan_and_grab().
-    @param disc A burn_disc suitable to pass to burn_disc_write.
+    @param disc Returns the newly created burn_disc object.
     @return <=0 error , 1 = success
 */
 int isoburn_prepare_new_image(struct burn_drive *d, struct burn_disc **disc,
diff --git a/libisoburn/trunk/test/xorriso_timestamp.h b/libisoburn/trunk/test/xorriso_timestamp.h
index 26676048..6dd918dc 100644
--- a/libisoburn/trunk/test/xorriso_timestamp.h
+++ b/libisoburn/trunk/test/xorriso_timestamp.h
@@ -1 +1 @@
-#define Xorriso_timestamP "2007.10.18.185731"
+#define Xorriso_timestamP "2007.10.18.221756"
diff --git a/libisoburn/trunk/test/xorrisoburn.c b/libisoburn/trunk/test/xorrisoburn.c
index a11da370..21fbfb53 100644
--- a/libisoburn/trunk/test/xorrisoburn.c
+++ b/libisoburn/trunk/test/xorrisoburn.c
@@ -259,7 +259,7 @@ int Xorriso_write_growing(struct XorrisO *xorriso, int flag)
  struct isoburn_source_opts sopts;
  struct burn_drive_info *dinfo;
  struct burn_drive *drive;
- struct burn_disc *disc;
+ struct burn_disc *disc= NULL;
  struct burn_write_opts *burn_options;
 
  ret= Xorriso_get_drive_handles(xorriso, &dinfo, &drive,
@@ -293,19 +293,19 @@ int Xorriso_write_growing(struct XorrisO *xorriso, int flag)
    Xorriso_process_msg_queues(xorriso,0);
    sprintf(xorriso->info_text,"Cannot prepare disc");
    Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "SORRY", 0);
-   return(0);
+   {ret= 0; goto ex;}
  }
 
  ret= Xorriso_make_write_options(xorriso, drive, &burn_options, 0);
  if(ret<=0)
-   return(ret);
+   goto ex;
  
  isoburn_disc_write(burn_options, disc);
  burn_write_opts_free(burn_options);
 
  ret= Xorriso_pacifier_loop(xorriso, drive, 0);
  if(ret<=0)
-   return(ret);
+   goto ex;
 
  ret= isoburn_activate_session(drive);
  Xorriso_process_msg_queues(xorriso,0);
@@ -313,13 +313,15 @@ int Xorriso_write_growing(struct XorrisO *xorriso, int flag)
    sprintf(xorriso->info_text,
            "Could not write new set of volume descriptors");
    Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "FATAL", 0);
-   return(ret);
+   goto ex;
  }
 
- /* >>> cleanup disc ? */
-
+ ret= 1;
+ex:;
+ if(disc!=NULL)
+   burn_disc_free(disc);
  Xorriso_process_msg_queues(xorriso,0);
- return(1);
+ return(ret);
 }