<s>
cDVD	B-Device
discs	O
,	O
also	O
known	O
as	O
mini-DVD	B-Device
discs	O
(	O
not	O
to	O
be	O
confused	O
with	O
8	B-Device
cm	I-Device
DVDs	I-Device
)	O
,	O
are	O
regular	O
data	B-Device
CDs	I-Device
that	O
contain	O
MPEG-2	B-Algorithm
or	O
MPEG-1	B-Algorithm
video	O
structured	O
in	O
accordance	O
with	O
the	O
DVD-Video	O
specifications	O
(	O
namely	O
,	O
a	O
VIDEO_TS	O
directory	O
containing	O
properly-authored	O
IFO/BUP	O
and	O
VOB	O
files	O
)	O
.	O
</s>
<s>
Such	O
discs	O
must	O
be	O
written	O
in	O
the	O
so-called	O
"	O
Mode	B-Device
1	I-Device
"	O
,	O
which	O
is	O
compatible	O
with	O
both	O
the	O
ISO	B-Application
9660	I-Application
and	O
UDF	O
1.02	O
filesystems	O
,	O
and	O
therefore	O
limits	O
the	O
amount	O
of	O
data	O
that	O
can	O
be	O
stored	O
on	O
an	O
80-minute	O
CD	O
to	O
700	O
MB	O
.	O
</s>
<s>
By	O
using	O
non-standard	O
resolutions	O
,	O
long	O
GOPs	B-General_Concept
,	O
more	O
B-frames	O
,	O
and	O
high-compression	O
quantization	O
matrices	O
,	O
it	O
is	O
possible	O
to	O
store	O
up	O
to	O
2	O
hours	O
of	O
video	O
with	O
audio	O
and	O
subtitles	O
on	O
a	O
regular	O
80-minute	O
CD	O
.	O
</s>
<s>
Until	O
2003	O
,	O
few	O
standalone	O
DVD-players	O
had	O
drives	O
capable	O
of	O
spinning	O
a	O
CD	O
at	O
the	O
8X	O
rate	O
needed	O
to	O
keep	O
up	O
with	O
the	O
maximum	O
data	O
stream	O
allowed	O
by	O
the	O
DVD-Video	O
specifications	O
,	O
but	O
today	O
,	O
many	O
models	O
contain	O
drives	O
similar	O
to	O
those	O
used	O
on	O
desktop	O
computers	O
,	O
and	O
more	O
versatile	O
firmware	B-Application
as	O
well	O
,	O
so	O
that	O
the	O
proper	O
playback	O
of	O
compact	O
DVDs	O
is	O
often	O
supported	O
,	O
but	O
rarely	O
documented	O
(	O
especially	O
in	O
North	O
America	O
and	O
Europe	O
)	O
.	O
</s>
