Try to read header chain from alleged -ROM media (e.g. DVD+RW in -ROM drive)

libisoburn/libisoburn.h

@@ -330,6 +330,10 @@ int isoburn_drive_scan_and_grab(struct burn_drive_info *drive_infos[],
                   bit1= regard overwriteable media as blank
                   bit2= if the drive is a regular disk file: truncate it to
                         the write start address
+                  bit3= if the drive reports a read-only profile try to read
+                        table of content by scanning for ISO image headers.
+                        (depending on media type and drive this might
+                         help or it might make the resulting toc even worse)
     @return       1 = success , 0 = drive not found , <0 = other error
 */
 int isoburn_drive_aquire(struct burn_drive_info *drive_infos[],