<s>
The	O
DWDD	B-Application
(	O
Domain	O
Wall	O
Displacement	O
Detection	O
)	O
is	O
a	O
media	O
reproducing	O
technology	O
developed	O
by	O
Canon	O
and	O
Sony	O
and	O
first	O
implemented	O
in	O
a	O
commercial	O
product	O
in	O
2004	O
as	O
part	O
of	O
Sony	O
's	O
Hi-MD	O
format	O
.	O
</s>
<s>
The	O
DWDD	B-Application
technology	O
uses	O
a	O
physics	O
phenomenon	O
called	O
domain	O
wall	O
displacement	O
,	O
which	O
shortens	O
the	O
masks	O
but	O
does	O
not	O
need	O
to	O
change	O
the	O
laser	O
beam	O
.	O
</s>
