gid is the 32-bit overflow gid -1 as defined by
           the UDF standard. The value is given as either <group> which is a
           valid group name or the corresponding decimal group id, or the
           special string "forget".

       umask=
           Mask out the given permissions from all inodes read from the
           filesystem. The value is given in octal.

       mode=
           If mode= is set the permissions of all non-directory inodes read
           from the filesystem will be set to the given mode. The value is
           given in octal.

       dmode=
           If dmode= is set the permissions of all directory inodes read from
           the filesystem will be set to the given dmode. The value is given in
           octal.

       bs=
           Set the block size. Default value prior to kernel version 2.6.30 was
           2048. Since 2.6.30 and prior to 4.11 it was logical device block
           size with fallback to 2048. Since 4.11 it is logical block size with
           fallback to any valid block size between logical device block size
           and 4096.

           For other details see the mkudffs(8) 2.0+ manpage, see the
           COMPATIBILITY and BLOCK SIZE sections.

       unhide
           Show otherwise hidden files.

       undelete
           Show deleted files in lists.

       adinicb
           Embed data in the inode. (default)

       noadinicb
           Don’t embed data in the inode.

       shortad
           Use short UDF address descriptors.

       longad
           Use long UDF address descriptors. (default)

       nostrict
           Unset strict conformance.

       iocharset=
           Set the NLS character set. This requires kernel compiled with
           CONFIG_UDF_NLS option.

       utf8
           Set the UTF-8 character set.

   Mount options for debugging and disaster recovery
       novrs
           Ignore the Volume Recognition Sequence and attempt to mount anyway.

       session=
           Select the session number for multi-session recorded optical media.
           (default= last session)

       anchor=
           Override standard anchor location. (default= 256)

       lastblock=
           Set the last block of the filesystem.

   Unused historical mount options that may be encountered and should be
       removed
       uid=ignore
           Ignored, use uid=<user> instead.

       gid=ignore
           Ignored, use gid=<group> instead.

       volume=
           Unimplemented and ignored.

       partition=
           Unimplemented and ignored.

       fileset=
           Unimplemented and ignored.

       rootdir=
           Unimplemented and ignored.

   Mount options for ufs
       ufstype=value
           UFS is a filesystem widely used in different operating systems. The
           problem are differences among implementations. Features of some
           implementations are undocumented, so its hard to recognize the type
           of ufs automatically. That’s why the user must specify the type of
           ufs by mount option. Possible values are:

           old
               Old format of ufs, this is the default, read only. (Don’t forget
               to give the -r option.)

           44bsd
               For filesystems created by a BSD-like system (NetBSD, FreeBSD,
               OpenBSD).

           ufs2
               Used in FreeBSD 5.x supported as read-write.

           5xbsd
               Synonym for ufs2.

           sun
               For filesystems created by SunOS or Solaris on Sparc.

           sunx86
               For filesystems created by Solaris on x86.

           hp
               For filesystems created by HP-UX, read-only.

           nextstep
               For filesystems created by NeXTStep (on NeXT station) (currently
               read only).

           nextstep-cd
               For NextStep CDROMs (block_size == 2048), read-only.

           openstep
               For filesystems created by OpenStep