diff --git a/xorriso/emulators.c b/xorriso/emulators.c
index 4ab891b5..815e366d 100644
--- a/xorriso/emulators.c
+++ b/xorriso/emulators.c
@@ -565,7 +565,7 @@ int Xorriso_genisofs_count_args(struct XorrisO *xorriso, int argc, char **argv,
     "-checksum_algorithm_iso", "-checksum_algorithm_template",
     "--stdio_sync", "--quoted_path_list", "--efi-boot", "--embedded-boot",
     "-isohybrid-mbr", "-e", "-partition_offset", "-partition_hd_cyl",
-    "-partition_sec_hd", "-untranslated_name_len",
+    "-partition_sec_hd", "-partition_cyl_align", "-untranslated_name_len",
     ""
  };
  static char arg2_options[][41]= {
@@ -761,6 +761,7 @@ int Xorriso_genisofs_help(struct XorrisO *xorriso, int flag)
 "  -partition_offset LBA       Make image mountable by first partition, too",
 "  -partition_sec_hd NUMBER    Define number of sectors per head",
 "  -partition_hd_cyl NUMBER    Define number of heads per cylinder",
+"  -partition_cyl_align MODE   Control cylinder alignment: off, on, auto",
 "  -mips-boot FILE             Set mips boot image name (relative to image root)",
 "  -mipsel-boot FILE           Set mipsel boot image name (relative to image root)",
 "  -B FILES, -sparc-boot FILES Set sparc boot image names",
@@ -1359,6 +1360,7 @@ not_enough_args:;
              strcmp(argv[i], "-partition_offset") == 0 ||
              strcmp(argv[i], "-partition_hd_cyl") == 0 ||
              strcmp(argv[i], "-partition_sec_hd") == 0 ||
+             strcmp(argv[i], "-partition_cyl_align") == 0 ||
              strcmp(argv[i], "-isohybrid-mbr")==0) {
      if(i+1>=argc)
        goto not_enough_args;
@@ -1798,7 +1800,8 @@ problem_handler_2:;
      xorriso->boot_image_cat_hidden|= 3;
    } else if(strcmp(argv[i], "-partition_offset") == 0 ||
              strcmp(argv[i], "-partition_sec_hd") == 0 ||
-             strcmp(argv[i], "-partition_hd_cyl") == 0) {
+             strcmp(argv[i], "-partition_hd_cyl") == 0 ||
+             strcmp(argv[i], "-partition_cyl_align") == 0) {
      if(i+1>=argc)
        goto not_enough_args;
      i++;
diff --git a/xorriso/opts_a_c.c b/xorriso/opts_a_c.c
index 2778fd79..96a08a17 100644
--- a/xorriso/opts_a_c.c
+++ b/xorriso/opts_a_c.c
@@ -932,6 +932,23 @@ treatment_patch:;
    }
    xorriso->partition_secs_per_head= u;
 
+ } else if(strncmp(treatpt, "partition_cyl_align=", 20)==0) {
+   if(strcmp(treatpt + 20, "auto") == 0)
+     xorriso->system_area_options= (xorriso->system_area_options & ~0x300);
+   else if(strcmp(treatpt + 20, "on") == 0)
+     xorriso->system_area_options=
+                               (xorriso->system_area_options & ~0x300) | 0x100;
+   else if(strcmp(treatpt + 20, "off") == 0)
+     xorriso->system_area_options=
+                               (xorriso->system_area_options & ~0x300) | 0x200;
+   else {
+     sprintf(xorriso->info_text,
+             "-boot_image %s partition_cyl_align: unknown mode : %s",
+             formpt, treatpt + 20);
+     Xorriso_msgs_submit(xorriso, 0, xorriso->info_text, 0, "SORRY", 0);
+     return(0);
+   }
+
  } else if(strncmp(treatpt, "platform_id=", 12)==0) {
    if(strncmp(treatpt + 12, "0x", 2) == 0)
      sscanf(treatpt + 14, "%x", &u);
diff --git a/xorriso/text_io.c b/xorriso/text_io.c
index 1c4b1f2e..81414841 100644
--- a/xorriso/text_io.c
+++ b/xorriso/text_io.c
@@ -1295,6 +1295,13 @@ 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);
 
+ ret= (xorriso->system_area_options & 0x300) >> 8;
+ is_default= (ret == 0);
+ sprintf(line,"-boot_image any partition_cyl_align=%s\n",
+         ret == 0 ? "auto" : ret == 1 ? "on" : "off");
+ if(!(is_default && no_defaults))
+   Xorriso_status_result(xorriso,filter,fp,flag&2);
+
  if((xorriso->system_area_disk_path[0] || !part_table_implicit) &&
     (xorriso->partition_offset == 0 || (xorriso->system_area_options & 2))) {
    is_default= ((xorriso->system_area_options & 3) == 0);
diff --git a/xorriso/xorriso_private.h b/xorriso/xorriso_private.h
index 67247ba0..81a053e6 100644
--- a/xorriso/xorriso_private.h
+++ b/xorriso/xorriso_private.h
@@ -341,6 +341,12 @@ struct XorrisO { /* the global context of xorriso */
                                                   else: unspecified type 
                                                1= MIPS Big Endian Volume Header
                                                2= MIPS Little Endian Boot Block
+                                               3= SUN Disk Label for SUN SPARC
+                                         bit8-9= Only with System area type 0
+                                               Cylinder alignment mode
+                                               0 = auto (align if bit1)
+                                               1 = always align
+                                               2 = never align
                                        */
  int patch_system_area;               /* Bits as of system_area_options.
                                          to be applied to the loaded system
diff --git a/xorriso/xorriso_timestamp.h b/xorriso/xorriso_timestamp.h
index 5a29c53c..d3feea09 100644
--- a/xorriso/xorriso_timestamp.h
+++ b/xorriso/xorriso_timestamp.h
@@ -1 +1 @@
-#define Xorriso_timestamP "2011.03.03.181601"
+#define Xorriso_timestamP "2011.03.03.181850"