<s>
Internal	B-Device
hard-drive	I-Device
defect	I-Device
management	I-Device
is	O
a	O
system	O
present	O
in	O
hard	B-Device
drives	I-Device
for	O
handling	O
of	O
bad	B-Device
sectors	I-Device
.	O
</s>
<s>
The	O
systems	O
are	O
generally	O
proprietary	O
and	O
vary	O
from	O
manufacturer	O
to	O
manufacturer	O
,	O
but	O
typically	O
consist	O
of	O
a	O
"	O
P	O
"	O
(	O
for	O
"	O
permanent	O
"	O
or	O
"	O
primary	O
"	O
)	O
list	O
of	O
bad	B-Device
sectors	I-Device
detected	O
in	O
the	O
manufacturing	O
stage	O
and	O
a	O
"	O
G	O
"	O
(	O
for	O
"	O
growth	O
"	O
)	O
list	O
of	O
bad	B-Device
sectors	I-Device
that	O
crop	O
up	O
after	O
manufacturing	O
.	O
</s>
<s>
Because	O
the	O
drive	O
is	O
remapping	O
its	O
own	O
bad	B-Device
sectors	I-Device
,	O
software	O
may	O
not	O
detect	O
growing	O
numbers	O
of	O
bad	B-Device
sectors	I-Device
until	O
later	O
stages	O
of	O
gradual	O
hard-disk	B-Device
failure	I-Device
(	O
which	O
in	O
some	O
cases	O
may	O
not	O
be	O
until	O
after	O
the	O
warranty	O
period	O
has	O
expired	O
.	O
)	O
</s>
