<s>
Packet	B-Device
writing	I-Device
(	O
or	O
incremental	O
packet	B-Device
writing	I-Device
,	O
IPW	B-Device
)	O
is	O
an	O
optical	B-Device
disc	I-Device
recording	I-Device
technology	I-Device
used	O
to	O
allow	O
write-once	O
and	O
rewritable	O
CD	B-Device
and	O
DVD	O
media	O
to	O
be	O
used	O
in	O
a	O
similar	O
manner	O
to	O
a	O
floppy	B-Device
disk	I-Device
from	O
within	O
the	O
operating	B-General_Concept
system	I-General_Concept
.	O
</s>
<s>
Packet	B-Device
writing	I-Device
allows	O
users	O
to	O
create	O
,	O
modify	O
,	O
and	O
delete	O
files	O
and	O
directories	O
on	O
demand	O
without	O
the	O
need	O
to	O
burn	B-Application
a	O
whole	O
disc	O
.	O
</s>
<s>
Packet	B-Device
writing	I-Device
technology	O
achieves	O
this	O
by	O
writing	O
data	O
in	O
incremental	O
blocks	O
rather	O
than	O
in	O
a	O
single	O
block	O
.	O
</s>
<s>
Deleting	O
files	O
and	O
directories	O
of	O
a	O
CD-R	O
using	O
packet	B-Device
writing	I-Device
technology	O
does	O
not	O
recover	O
the	O
space	O
occupied	O
by	O
these	O
objects	O
but	O
,	O
rather	O
,	O
they	O
are	O
simply	O
marked	O
as	O
being	O
deleted	O
(	O
making	O
them	O
effectively	O
hidden	O
)	O
.	O
</s>
<s>
Because	O
of	O
this	O
,	O
the	O
available	O
space	O
on	O
a	O
non-rewritable	O
medium	O
using	O
packet	B-Device
writing	I-Device
technology	O
will	O
decrease	O
every	O
time	O
its	O
content	O
is	O
modified	O
.	O
</s>
<s>
The	O
most	O
common	O
file	O
system	O
for	O
packet	B-Device
writing	I-Device
systems	O
is	O
UDF	O
.	O
</s>
<s>
Due	O
to	O
the	O
characteristics	O
of	O
optical	O
rewritable	O
media	O
such	O
as	O
CD-RWs	O
and	O
DVD-RWs	O
,	O
the	O
ability	O
of	O
data	O
sectors	O
to	O
hold	O
their	O
contents	O
diminishes	O
when	O
changing	O
them	O
frequently	O
(	O
since	O
re-crystallized	O
alloy	O
de-crystallizes	O
)	O
.	O
</s>
<s>
To	O
cope	O
with	O
this	O
the	O
packet	B-Device
writing	I-Device
system	O
can	O
remap	O
bad	O
sectors	O
with	O
good	O
sectors	O
as	O
required	O
.	O
</s>
<s>
Packet	B-Device
writing	I-Device
is	O
most	O
popularly	O
implemented	O
by	O
Microsoft	O
since	O
Windows	B-Application
Vista	I-Application
,	O
where	O
it	O
is	O
referred	O
to	O
as	O
the	O
Live	B-Device
File	I-Device
System	I-Device
.	O
</s>
<s>
Software	O
implementing	O
packet	B-Device
writing	I-Device
includes	O
:	O
</s>
