<s>
Rainbow	B-General_Concept
storage	I-General_Concept
is	O
a	O
developing	O
paper-based	O
data	B-General_Concept
storage	I-General_Concept
technique	O
first	O
demonstrated	O
by	O
Indian	O
student	O
Sainul	B-General_Concept
Abideen	I-General_Concept
in	O
November	O
2006	O
.	O
</s>
<s>
The	O
Rainbow	B-General_Concept
data	B-General_Concept
storage	I-General_Concept
technology	I-General_Concept
claims	O
to	O
use	O
geometric	O
shapes	O
such	O
as	O
triangles	O
,	O
circles	O
and	O
squares	O
of	O
various	O
colors	O
to	O
store	O
a	O
large	O
amount	O
of	O
data	O
on	O
ordinary	O
paper	O
or	O
plastic	O
surfaces	O
.	O
</s>
<s>
This	O
would	O
provide	O
several	O
advantages	O
over	O
current	O
forms	O
of	O
optical	B-Device
-	I-Device
or	O
magnetic	B-Architecture
data	I-Architecture
storage	I-Architecture
like	O
less	O
environmental	O
pollution	O
due	O
to	O
the	O
biodegradability	O
of	O
paper	O
,	O
low	O
cost	O
and	O
high	O
capacity	O
.	O
</s>
<s>
Data	O
could	O
be	O
stored	O
on	O
"	O
Rainbow	B-General_Concept
Versatile	O
Disk	O
"	O
(	O
RVD	O
)	O
or	O
plastic/paper	O
cards	O
of	O
any	O
form	O
factor	O
(	O
like	O
SIM	O
cards	O
)	O
.	O
</s>
<s>
the	O
compression	O
scheme	O
must	O
be	O
a	O
revolutionary	O
lossless	B-Algorithm
compression	I-Algorithm
algorithm	O
.	O
</s>
<s>
The	O
theory	O
is	O
:	O
If	O
Rainbow	B-General_Concept
's	O
"	O
geometric	O
"	O
algorithm	O
is	O
to	O
be	O
encoded	O
and	O
decoded	O
by	O
a	O
computer	O
,	O
it	O
would	O
equally	O
viable	O
to	O
store	O
the	O
compressed	O
data	O
on	O
a	O
conventional	O
disk	O
rather	O
than	O
printing	O
it	O
to	O
paper	O
or	O
other	O
non-digital	O
medium	O
.	O
</s>
<s>
Printing	O
something	O
as	O
dots	O
on	O
a	O
page	O
rather	O
than	O
bits	O
on	O
a	O
disk	O
will	O
not	O
change	O
the	O
underlying	O
compression	O
ratio	O
,	O
so	O
a	O
lossless	B-Algorithm
compression	I-Algorithm
algorithm	O
that	O
could	O
store	O
250	O
gigabytes	O
within	O
a	O
few	O
hundred	O
megabytes	O
of	O
data	O
would	O
be	O
revolutionary	O
indeed	O
.	O
</s>
<s>
However	O
Sainul	B-General_Concept
Abideen	I-General_Concept
says	O
that	O
the	O
articles	O
are	O
based	O
on	O
misunderstandings	O
.	O
</s>
<s>
Density	O
of	O
storage	O
in	O
paper	O
will	O
be	O
very	O
small	O
and	O
the	O
density	O
will	O
be	O
depends	O
on	O
the	O
storage	B-General_Concept
medium	I-General_Concept
,	O
capacity	O
of	O
colour	O
representation	O
and	O
retrieval	O
methods	O
etc	O
.	O
</s>
<s>
Absolute	O
rainbow	B-General_Concept
dots	O
are	O
used	O
to	O
detect	O
errors	O
caused	O
by	O
scratches	O
,	O
and	O
whether	O
any	O
fading	O
has	O
occurred	O
.	O
</s>
<s>
Absolute	O
rainbow	B-General_Concept
dots	O
are	O
predefined	O
dots	O
carrying	O
a	O
unique	O
value	O
.	O
</s>
<s>
These	O
dots	O
can	O
be	O
inserted	O
in	O
the	O
rainbow	B-General_Concept
picture	O
in	O
pre-specified	O
areas	O
.	O
</s>
<s>
Absolute	O
rainbow	B-General_Concept
dots	O
will	O
be	O
microscopically	O
small	O
so	O
that	O
they	O
occupy	O
very	O
little	O
space	O
in	O
the	O
rainbow	B-General_Concept
picture	O
.	O
</s>
