<s>
IBM	O
defines	O
optical	B-General_Concept
storage	I-General_Concept
as	O
"	O
any	O
storage	O
method	O
that	O
uses	O
a	O
laser	O
to	O
store	O
and	O
retrieve	O
data	O
from	O
optical	O
media.	O
"	O
</s>
<s>
Compact	O
disc	O
(	O
CD	O
)	O
and	O
DVD	O
are	O
examples	O
of	O
optical	B-Device
media	I-Device
.	O
</s>
<s>
Optical	B-General_Concept
storage	I-General_Concept
is	O
the	O
storage	B-General_Concept
of	I-General_Concept
data	I-General_Concept
on	O
an	O
optically	O
readable	O
medium	O
.	O
</s>
<s>
Data	O
is	O
recorded	O
by	O
making	O
marks	O
in	O
a	O
pattern	O
that	O
can	O
be	O
read	O
back	O
with	O
the	O
aid	O
of	O
light	O
,	O
usually	O
a	O
beam	O
of	O
laser	O
light	O
precisely	O
focused	O
on	O
a	O
spinning	O
optical	B-Device
disc	I-Device
.	O
</s>
<s>
An	O
older	O
example	O
of	O
optical	B-General_Concept
storage	I-General_Concept
that	O
does	O
not	O
require	O
the	O
use	O
of	O
computers	O
,	O
is	O
microform	O
.	O
</s>
<s>
An	O
optical	B-Device
disc	I-Device
drive	O
is	O
a	O
device	O
in	O
a	O
computer	O
that	O
can	O
read	O
CD-ROMs	B-Device
or	O
other	O
optical	B-Device
discs	I-Device
,	O
such	O
as	O
DVDs	O
and	O
Blu-ray	O
discs	O
.	O
</s>
<s>
Optical	B-General_Concept
storage	I-General_Concept
differs	O
from	O
other	O
data	O
storage	O
techniques	O
that	O
make	O
use	O
of	O
other	O
technologies	O
such	O
as	O
magnetism	O
,	O
such	O
as	O
floppy	B-Device
disks	I-Device
and	O
hard	B-Device
disks	I-Device
,	O
or	O
semiconductors	O
,	O
such	O
as	O
flash	B-Device
memory	I-Device
.	O
</s>
<s>
Optical	B-General_Concept
storage	I-General_Concept
in	O
the	O
form	O
of	O
discs	O
grants	O
the	O
ability	O
to	O
record	O
onto	O
a	O
compact	O
disc	O
in	O
real	O
time	O
.	O
</s>
<s>
Optical	B-General_Concept
storage	I-General_Concept
also	O
gained	O
importance	O
for	O
its	O
green	O
qualities	O
and	O
its	O
efficiency	O
with	O
high	O
energies	O
.	O
</s>
<s>
Optical	B-General_Concept
storage	I-General_Concept
can	O
range	O
from	O
a	O
single	O
drive	O
reading	O
a	O
single	O
CD-ROM	B-Device
to	O
multiple	O
drives	O
reading	O
multiple	O
discs	O
such	O
as	O
an	O
optical	B-Device
jukebox	I-Device
.	O
</s>
<s>
Single	O
CDs	O
(	O
compact	O
discs	O
)	O
can	O
hold	O
around	O
700	O
MB	O
(	O
megabytes	O
)	O
and	O
optical	B-Device
jukeboxes	I-Device
can	O
hold	O
much	O
more	O
.	O
</s>
<s>
Optical	B-General_Concept
storage	I-General_Concept
includes	O
CDs	O
and	O
DVDs	O
.	O
</s>
<s>
In	O
1985	O
,	O
the	O
New	O
York	O
Times	O
said	O
about	O
optical	B-General_Concept
storage	I-General_Concept
,	O
"	O
the	O
rumor	O
refuses	O
to	O
die.	O
"	O
</s>
<s>
The	O
1978-introduced	O
LaserDisc	O
and	O
1982-introduced	O
audio/music	O
CD	O
had	O
made	O
a	O
data-storing	O
optical	B-Device
media	I-Device
format	O
,	O
introduced	O
in	O
1984	O
at	O
a	O
trade	O
show	O
,	O
seem	O
feasible	O
.	O
</s>
<s>
In	O
2005	O
,	O
the	O
patent	O
for	O
an	O
Optical	B-Device
Storage	I-Device
Device	I-Device
in	O
the	O
form	O
of	O
a	O
compact	O
disc	O
recorder	O
was	O
published	O
by	O
Peter	O
J	O
.	O
Keller	O
and	O
Michael	O
J	O
.	O
Kelley	O
.	O
</s>
<s>
The	O
Optical	B-General_Concept
Storage	I-General_Concept
Technology	O
Association	O
(	O
OSTA	O
)	O
was	O
an	O
international	O
trade	O
association	O
formed	O
to	O
promote	O
the	O
use	O
of	O
recordable	O
optical	B-General_Concept
data	I-General_Concept
storage	I-General_Concept
technologies	O
and	O
products	O
.	O
</s>
