<s>
Archival	B-Device
Disc	I-Device
(	O
AD	O
)	O
is	O
the	O
name	O
of	O
a	O
trademark	O
owned	O
by	O
Sony	O
and	O
Panasonic	O
describing	O
an	O
optical	B-Device
disc	I-Device
storage	B-General_Concept
medium	I-General_Concept
designed	O
for	O
long-term	O
digital	B-General_Concept
storage	I-General_Concept
.	O
</s>
<s>
The	O
agreement	O
between	O
Sony	O
and	O
Panasonic	O
to	O
jointly	O
develop	O
the	O
next	O
generation	O
optical	B-Device
media	I-Device
standard	O
was	O
first	O
announced	O
on	O
29July	O
2013	O
.	O
</s>
<s>
The	O
Archival	B-Device
Disc	I-Device
standard	O
jointly	O
developed	O
by	O
Sony	O
and	O
Panasonic	O
will	O
utilise	O
signal	O
processing	O
technologies	O
such	O
as	O
narrow	O
track	O
pitch	O
crosstalk	O
cancellation	O
,	O
high	O
linear	O
density	O
inter-symbol	O
interference	O
cancellation	O
and	O
multi-level	B-Device
recording	I-Device
.	O
</s>
<s>
The	O
track	O
pitch	O
is	O
0.225μm	O
,	O
the	O
data	O
bit	O
length	O
is	O
79.5nm	O
,	O
and	O
the	O
standard	O
will	O
utilise	O
the	O
method	O
of	O
Reed	B-Error_Name
–	I-Error_Name
Solomon	I-Error_Name
Code	I-Error_Name
error	O
correction	O
.	O
</s>
<s>
In	O
2019	O
,	O
Sony	O
,	O
co-developed	O
with	O
Panasonic	O
,	O
releasing	O
its	O
third	O
generation	O
Optical	B-Device
Disc	I-Device
Archival	O
.	O
</s>
<s>
In	O
2020	O
,	O
Sony	O
began	O
shipping	O
out	O
the	O
Sony	O
Gen3	O
PetaSite	O
Optical	B-Device
Disc	I-Device
Archive	I-Device
,	O
a	O
storage	O
solution	O
that	O
can	O
store	O
up	O
to	O
2.9	O
million	O
GB	O
of	O
data	O
.	O
</s>
<s>
In	O
the	O
summer	O
of	O
2015	O
,	O
Sony	O
was	O
scheduled	O
to	O
release	O
a	O
roadmap	O
plan	O
to	O
increase	O
Archival	B-Device
Disc	I-Device
capacity	O
from	O
300GB	O
to	O
1TB	O
per	O
disc	O
.	O
</s>
<s>
Sony	O
expects	O
the	O
new	O
standard	O
to	O
see	O
usage	O
in	O
the	O
film	O
industry	O
(	O
such	O
as	O
storage	O
of	O
4K	B-Architecture
resolution	I-Architecture
audiovisual	O
data	O
)	O
,	O
archival	O
services	O
,	O
and	O
cloud	B-Architecture
data	I-Architecture
centres	I-Architecture
handling	O
big	B-Application
data	I-Application
.	O
</s>
<s>
The	O
disc	O
format	O
is	O
not	O
intended	O
as	O
a	O
consumer	O
storage	B-General_Concept
medium	I-General_Concept
as	O
of	O
2014	O
,	O
but	O
is	O
intended	O
by	O
the	O
two	O
companies	O
as	O
a	O
solution	O
for	O
professional-level	O
data	O
archival	O
.	O
</s>
<s>
In	O
order	O
to	O
reach	O
a	O
larger	O
capacity	O
whilst	O
ensuring	O
higher	O
playback	O
signal	O
quality	O
,	O
the	O
standard	O
will	O
employ	O
crosstalk	O
cancellation	O
and	O
partial-response	B-Device
maximum-likelihood	I-Device
(	O
PRML	B-Device
)	O
signal	O
processing	O
.	O
</s>
<s>
Sony	O
will	O
be	O
using	O
Archival	B-Device
Disc	I-Device
in	O
the	O
Optical	B-Device
Disc	I-Device
Archive	I-Device
professional	O
archival	O
product	O
range	O
.	O
</s>
<s>
Sony	O
's	O
aim	O
is	O
to	O
create	O
at	O
least	O
a	O
6TB	O
storage	B-General_Concept
medium	I-General_Concept
.	O
</s>
<s>
Sony	O
(	O
as	O
of	O
2020	O
)	O
sells	O
5.5TB	O
Optical	B-Device
Disc	I-Device
Archive	I-Device
Cartridges	O
.	O
</s>
<s>
An	O
emerging	O
use	O
case	O
for	O
Archival	B-Device
Disc	I-Device
has	O
been	O
projected	O
for	O
cold	O
data	B-General_Concept
storage	I-General_Concept
within	O
the	O
datacenter	O
.	O
</s>
