<s>
Ultra	B-Application
Density	I-Application
Optical	I-Application
(	O
UDO	O
)	O
is	O
an	O
optical	B-Device
disc	I-Device
format	O
designed	O
for	O
high-density	O
storage	O
of	O
high-definition	B-Device
video	I-Device
and	O
data	O
.	O
</s>
<s>
An	O
Ultra	B-Application
Density	I-Application
Optical	I-Application
disc	I-Device
,	O
or	O
UDO	O
,	O
is	O
a	O
133.35	O
mm	O
(	O
5.25	O
"	O
)	O
ISO	O
cartridge	O
optical	B-Device
disc	I-Device
which	O
can	O
store	O
up	O
to	O
30	O
GB	O
of	O
data	O
.	O
</s>
<s>
Utilizing	O
a	O
design	O
based	O
on	O
the	O
Magneto-optical	B-Device
disc	I-Device
,	O
but	O
using	O
Phase	O
Change	O
technology	O
combined	O
with	O
a	O
blue	O
violet	O
laser	O
,	O
a	O
UDO/UDO2	O
disc	O
can	O
store	O
substantially	O
more	O
data	O
than	O
a	O
magneto-optical	B-Device
(	O
MO	O
)	O
disc	O
.	O
</s>
<s>
UDO	O
optical	B-Device
disc	I-Device
storage	O
media	O
was	O
developed	O
as	O
a	O
replacement	O
for	O
the	O
9.1	O
GB	O
Magneto-optical	B-Device
digital	O
storage	O
medium	O
.	O
</s>
<s>
The	O
Ultra	B-Application
Density	I-Application
Optical	I-Application
was	O
first	O
announced	O
by	O
Sony	O
on	O
November	O
1	O
,	O
2000	O
.	O
</s>
<s>
Currently	O
UDO/UDO2	O
is	O
being	O
championed	O
by	O
its	O
development	O
partners	O
Plasmon	O
,	O
Asahi	B-Algorithm
Pentax	I-Algorithm
(	O
responsible	O
for	O
the	O
opto-mechanical	O
assembly	O
design	O
)	O
,	O
Mitsubishi	O
Chemical	O
,	O
parent	O
company	O
of	O
the	O
Verbatim	O
media	O
storage	O
brand	O
,	O
and	O
various	O
computer	O
and	O
IT	O
solutions	O
companies	O
.	O
</s>
<s>
There	O
are	O
three	O
versions	O
of	O
UDO/UDO	O
media	O
:	O
a	O
True	O
WORM	B-Device
(	O
Write	B-Device
Once	I-Device
Read	I-Device
Many	I-Device
)	O
,	O
an	O
R/W	O
(	O
Re-Writable	O
)	O
,	O
and	O
Compliant	O
WORM	B-Device
(	O
shreddable	O
WORM	B-Device
)	O
.	O
</s>
<s>
Rewritable	O
media	O
is	O
typically	O
used	O
in	O
archive	O
applications	O
where	O
the	O
stability	O
and	O
longevity	O
of	O
optical	B-Device
media	I-Device
are	O
important	O
,	O
but	O
archive	O
records	O
change	O
on	O
a	O
relatively	O
frequent	O
or	O
discretionary	O
basis	O
.	O
</s>
<s>
The	O
table	O
below	O
summarizes	O
the	O
differences	O
between	O
conventional	O
Magneto-Optical	B-Device
specifications	O
and	O
those	O
of	O
the	O
enhanced	O
Ultra	B-Application
Density	I-Application
Optical	I-Application
disc	O
.	O
</s>
<s>
The	O
opto-mechanism	O
design	O
of	O
current	O
Plasmon	O
UDO	O
drives	O
was	O
jointly	O
developed	O
with	O
Asahi	B-Algorithm
Pentax	I-Algorithm
.	O
</s>
<s>
Apart	O
from	O
the	O
storage	O
size	O
,	O
the	O
discs	O
(	O
like	O
Magneto	B-Device
Optical	I-Device
discs	O
)	O
are	O
designed	O
for	O
durability	O
and	O
long	O
term	O
reliability	O
.	O
</s>
<s>
The	O
core	O
technology	O
for	O
UDO	O
is	O
essentially	O
similar	O
to	O
Blu-ray	O
Discs	O
,	O
as	O
well	O
as	O
PDD	B-Device
(	O
all	O
were	O
developed	O
by	O
Sony	O
)	O
,	O
although	O
there	O
are	O
a	O
number	O
of	O
key	O
differences	O
;	O
the	O
primary	O
ones	O
being	O
:	O
</s>
<s>
UDO	O
provides	O
absolute	O
data	B-Error_Name
authenticity	I-Error_Name
for	O
applications	O
where	O
archived	O
information	O
must	O
remain	O
100%	O
unchanged	O
–	O
banks	O
and	O
legal	O
institutions	O
,	O
for	O
example	O
.	O
</s>
<s>
The	O
design	O
of	O
the	O
UDO	O
,	O
with	O
a	O
tested	O
,	O
stable	O
recording	O
surface	O
,	O
protective	O
coating	O
,	O
and	O
encasement	O
in	O
a	O
cartridge	O
,	O
is	O
expected	O
to	O
give	O
it	O
at	O
least	O
50	O
years	O
storage	O
life	O
,	O
minimizing	O
the	O
frequency	O
of	O
data	B-General_Concept
migration	I-General_Concept
and	O
management	O
for	O
firms	O
requiring	O
storage	O
for	O
large	O
amounts	O
of	O
important	O
data	O
.	O
</s>
<s>
Blue	O
laser	O
technology	O
gives	O
the	O
30	O
GB	O
UDO	O
more	O
than	O
three	O
times	O
the	O
capacity	O
of	O
previous	O
generation	O
MO	O
(	O
Magneto	B-Device
Optical	I-Device
)	O
and	O
DVD	O
technologies	O
.	O
</s>
