Default: auto Example: rdb Since: 2.1.1 This option can be used to enable RDB mode for an empty HDF file (which is missing the RDSK header). You may need to use this option in order to partition the HDF file from the Amiga side, but on susequent use, FS-UAE should automatically detect the HDF files as an RDB file, and this option is no longer needed for that file.