<s>
The	O
Stacked	B-Device
Volumetric	I-Device
Optical	I-Device
Disc	I-Device
(	O
or	O
SVOD	O
)	O
is	O
an	O
optical	B-Device
disc	I-Device
format	O
developed	O
by	O
Hitachi	O
Maxell	O
,	O
which	O
uses	O
an	O
array	O
of	O
wafer-thin	O
optical	B-Device
discs	I-Device
to	O
allow	O
data	O
storage	O
.	O
</s>
<s>
Hitachi	O
Maxell	O
developed	O
systems	O
both	O
for	O
burning	B-Application
to	O
the	O
media	O
using	O
standard	O
DVD	O
optical	O
heads	O
,	O
and	O
pre-recording	O
to	O
the	O
media	O
using	O
a	O
special	O
heat	O
imprint	O
technique	O
they	O
called	O
"	O
nanoimprinting.	O
"	O
</s>
<s>
The	O
primary	O
application	O
of	O
the	O
SVOD	O
system	O
seemed	O
to	O
be	O
business	O
data	O
archival	O
,	O
replacing	O
digital	O
tape	B-Architecture
archives	I-Architecture
.	O
</s>
<s>
In	O
2007	O
,	O
Japanese	O
broadcaster	O
NHK	O
announced	O
a	O
similar	O
system	O
,	O
based	O
on	O
Blu-ray	O
discs	O
,	O
of	O
stacked	O
optical	B-Device
storage	I-Device
media	I-Device
specifically	O
designed	O
to	O
rotate	O
at	O
high	O
speeds	O
,	O
up	O
to	O
15,000	O
RPM	O
.	O
</s>
<s>
SVOD	O
was	O
anticipated	O
to	O
be	O
a	O
likely	O
be	O
a	O
candidate	O
,	O
along	O
with	O
Holographic	B-Device
Versatile	I-Device
Discs	I-Device
(	O
HVDs	O
)	O
,	O
to	O
be	O
a	O
next-generation	O
optical	B-Device
disc	I-Device
standard	O
.	O
</s>
