diff --git a/libisofs/ecma119.h b/libisofs/ecma119.h
index 08eec36..5b7afc1 100644
--- a/libisofs/ecma119.h
+++ b/libisofs/ecma119.h
@@ -713,6 +713,15 @@ struct ecma119_image
      *       0 = auto (align if bit1)
      *       1 = always align to cylinder boundary
      *       2 = never align to cylinder boundary
+     *       3 = always align, additionally pad up and align partitions
+     *           which were appended by iso_write_opts_set_partition_img()
+     * bit10-13= System area sub type
+     *       With type 0 = MBR:
+     *         Gets overridden by bit0 and bit1.
+     *         0 = no particular sub type
+     *         1 = CHRP: A single MBR partition of type 0x96 covers the
+     *                   ISO image. Not compatible with any other feature
+     *                   which needs to have own MBR partition entries.
      */
     int system_area_options;
 
diff --git a/libisofs/filesrc.c b/libisofs/filesrc.c
index 3c8ed65..c3feb8c 100644
--- a/libisofs/filesrc.c
+++ b/libisofs/filesrc.c
@@ -335,6 +335,9 @@ int filesrc_writer_compute_data_blocks(IsoImageWriter *writer)
     t = writer->target;
     filelist = (IsoFileSrc **) writer->data;
 
+    /* >>> HFS: need to align to allocation block size */;
+    /* >>> HFS: ??? how to handle multi-extent files ? */;
+
     t->filesrc_start = t->curblock;
 
     /* Give all extent addresses their final absolute value */
@@ -488,6 +491,8 @@ int iso_filesrc_write_data(Ecma119Image *t, IsoFileSrc *file,
     }
 #endif
 
+    /* >>> HFS: need to align to allocation block size */;
+
 #ifdef Libisofs_with_libjtE
     if (t->libjte_handle != NULL) {
         res = libjte_begin_data_file(t->libjte_handle, name,
diff --git a/libisofs/libisofs.h b/libisofs/libisofs.h
index 3dcbda4..5865771 100644
--- a/libisofs/libisofs.h
+++ b/libisofs/libisofs.h
@@ -2180,6 +2180,9 @@ int iso_write_opts_set_fifo_size(IsoWriteOpts *opts, size_t fifo_size);
  *                0 = auto (align if bit1)
  *                1 = always align to cylinder boundary
  *                2 = never align to cylinder boundary
+ *                3 = always align, additionally pad up and align partitions
+ *                    which were appended by iso_write_opts_set_partition_img()
+ *                    @since 1.2.6
  *        bit10-13= System area sub type
  *              @since 1.2.4
  *              With type 0 = MBR:
@@ -7464,42 +7467,12 @@ int iso_image_hfsplus_get_blessed(IsoImage *img, IsoNode ***blessed_nodes,
     This allows to use arbitrary program code as provider of track input data.
 
     Objects compliant to this interface are either provided by the application
-    or by API calls of libburn: burn_fd_source_new() , burn_file_source_new(),
+    or by API calls of libburn: burn_fd_source_new(), burn_file_source_new(),
     and burn_fifo_source_new().
 
-    The API calls allow to use any file object as data source. Consider to feed
-    an eventual custom data stream asynchronously into a pipe(2) and to let
-    libburn handle the rest. 
-    In this case the following rule applies:
-    Call burn_source_free() exactly once for every source obtained from
-    libburn API. You MUST NOT otherwise use or manipulate its components.
+    libisofs acts as "application" and implements an own class of burn_source.
+    Instances of that class are handed out by iso_image_create_burn_source().
 
-    In general, burn_source objects can be freed as soon as they are attached
-    to track objects. The track objects will keep them alive and dispose them
-    when they are no longer needed. With a fifo burn_source it makes sense to
-    keep the own reference for inquiring its state while burning is in
-    progress.
-
-    ---
-
-    The following description of burn_source applies only to application
-    implemented burn_source objects. You need not to know it for API provided
-    ones.
-
-    If you really implement an own passive data producer by this interface,
-    then beware: it can do anything and it can spoil everything.
-
-    In this case the functions (*read), (*get_size), (*set_size), (*free_data)
-    MUST be implemented by the application and attached to the object at
-    creation time.
-    Function (*read_sub) is allowed to be NULL or it MUST be implemented and
-    attached.
-
-    burn_source.refcount MUST be handled properly: If not exactly as many
-    references are freed as have been obtained, then either memory leaks or
-    corrupted memory are the consequence.
-    All objects which are referred to by *data must be kept existent until
-    (*free_data) is called via burn_source_free() by the last referer.
 */
 struct burn_source {
 
diff --git a/libisofs/system_area.c b/libisofs/system_area.c
index ee41e25..26ccf94 100644
--- a/libisofs/system_area.c
+++ b/libisofs/system_area.c
@@ -126,8 +126,7 @@ int iso_compute_append_partitions(Ecma119Image *t, int flag)
 
     sa_type = (t->system_area_options >> 2) & 0x3f;
     cyl_align = (t->system_area_options >> 8) & 0x3;
-    if (sa_type == 0 && (cyl_align == 1 ||
-                      (cyl_align == 0 && (t->system_area_options & 3) == 2))) {
+    if (sa_type == 0 && cyl_align == 3) {
         cyl_size = t->partition_heads_per_cyl * t->partition_secs_per_head;
         if (cyl_size % 4)
             cyl_size = 0;
@@ -1682,7 +1681,7 @@ int iso_align_isohybrid(Ecma119Image *t, int flag)
         iso_msgs_submit(0, msg, 0, "NOTE", 0);
     }
 
-    if (always_align >= 2)
+    if (always_align == 2)
         {ret = ISO_SUCCESS; goto ex;}
 
     cylsize = 0;