diff --git a/libisoburn/trunk/xorriso/make_isohybrid_mbr.c b/libisoburn/trunk/xorriso/make_isohybrid_mbr.c
index 03185f2b..ae139fb8 100644
--- a/libisoburn/trunk/xorriso/make_isohybrid_mbr.c
+++ b/libisoburn/trunk/xorriso/make_isohybrid_mbr.c
@@ -108,7 +108,7 @@ int make_isohybrid_mbr(int bin_lba, int *img_blocks, char *mbr, int flag)
  84: Gets size of image in bytes.
  89:
 */
- imgsize= ((off_t) img_blocks) * (off_t) 2048;
+ imgsize= ((off_t) *img_blocks) * (off_t) 2048;
 
 /*
  90: Computes $padding, size of padded image and number $c of
@@ -158,12 +158,17 @@ int make_isohybrid_mbr(int bin_lba, int *img_blocks, char *mbr, int flag)
  gettimeofday(&tv, &tz);
  id= 0xffffffff & (tv.tv_sec ^ (tv.tv_usec * 2000));
 
+/* <<< for comparison with the perl script only
+ id= 1234567890;
+*/
+
 /* 
 126: Adds 4 id bytes and 2 zero bytes.
 */
  lsb_to_buf(&wpt, id, 32, 0);
  lsb_to_buf(&wpt, 0, 16, 0);
 
+
 /*
 129: Composes 16 byte record from the parameters determined
 147: so far. Appends it to buffer and add 48 zero bytes.
@@ -224,6 +229,21 @@ int main(int argc, char **argv)
 
  if(ret <= 0)
    exit(1);
+
+/* <<< for comparison with the perl script only
+{
+ FILE *fp;
+
+ fp= fopen("/u/test/mbr_make_isohybrid_mbr", "w");
+ if(fp == NULL) {
+   perror("make_isohybrid_mbr");
+   exit(2);
+ }
+ fwrite(mbr, 512, 1, fp);
+ fclose(fp);
+}
+*/
+
  exit(0);
 }