<s>
Track0	B-Application
(	O
pronounced	O
'	O
track	O
zero	O
 '	O
)	O
is	O
the	O
area	O
located	O
at	O
the	O
start	O
of	O
a	O
computer	O
disk	O
and	O
is	O
predominantly	O
used	O
to	O
store	O
information	O
regarding	O
the	O
layout	O
of	O
the	O
disk	O
(	O
the	O
partition	O
table	O
)	O
and	O
executable	O
code	O
needed	O
to	O
boot	O
an	O
operating	B-General_Concept
system	I-General_Concept
.	O
</s>
<s>
Track0	B-Application
typically	O
consists	O
of	O
the	O
first	O
64	O
sectors	B-Application
of	O
the	O
disk	O
(	O
since	O
each	O
sector	O
is	O
normally	O
512	B-Application
bytes	I-Application
,	O
this	O
corresponds	O
to	O
32,768	O
bytes	O
=	O
32KiB	O
)	O
.	O
</s>
<s>
Since	O
the	O
first	O
sector	O
of	O
a	O
disk	O
is	O
sector	O
zero	O
,	O
the	O
first	O
64	O
sectors	B-Application
are	O
sectors	B-Application
0	O
to	O
63	O
.	O
</s>
<s>
The	O
first	O
sector	O
of	O
Track0	B-Application
is	O
known	O
as	O
the	O
master	B-Device
boot	I-Device
record	I-Device
(	O
MBR	O
)	O
and	O
contains	O
the	O
initial	O
code	O
used	O
to	O
boot	O
the	O
operating	B-General_Concept
system	I-General_Concept
(	O
bootstrap	O
code	O
)	O
.	O
</s>
<s>
Track0	B-Application
is	O
also	O
increasingly	O
used	O
to	O
store	O
licensing	O
information	O
for	O
particular	O
pieces	O
of	O
software	O
because	O
it	O
is	O
an	O
area	O
of	O
the	O
disk	O
outside	O
of	O
the	O
OS	O
filesystem	B-Application
and	O
not	O
seen	O
or	O
used	O
by	O
most	O
computer	O
users	O
(	O
and	O
therefore	O
cannot	O
be	O
easily	O
modified	O
or	O
replicated	O
)	O
.	O
</s>
<s>
The	O
origins	O
of	O
Track0	B-Application
came	O
about	O
from	O
the	O
original	O
specifications	O
of	O
PCs	O
,	O
where	O
computer	O
hard	O
disks	O
were	O
defined	O
in	O
terms	O
of	O
Cylinders	O
,	O
Heads	O
and	O
Sectors	B-Application
(	O
CHS	B-Device
system	I-Device
)	O
.	O
</s>
<s>
In	O
this	O
context	O
,	O
Track0	B-Application
was	O
defined	O
to	O
be	O
all	O
the	O
sectors	B-Application
on	O
the	O
first	O
cylinder	O
and	O
first	O
head	O
.	O
</s>
<s>
As	O
with	O
many	O
(	O
now	O
legacy	O
)	O
original	O
PC	O
specifications	O
,	O
the	O
terminology	O
stuck	O
and	O
the	O
first	O
63	O
sectors	B-Application
of	O
modern	O
hard	O
disks	O
are	O
still	O
referred	O
to	O
as	O
Track0	B-Application
.	O
</s>
<s>
Track0	B-Application
is	O
physically	O
located	O
on	O
the	O
outer	O
edge	O
of	O
the	O
disk	O
platter	O
.	O
</s>
<s>
Track0	B-Application
is	O
also	O
the	O
name	O
of	O
a	O
terminate-and-stay-resident	O
MS-DOS	B-Application
program	O
that	O
allows	O
users	O
to	O
revive	O
floppy	B-Device
disks	I-Device
with	O
defective	O
first	O
tracks	O
by	O
swapping	O
it	O
with	O
another	O
track	O
under	O
the	O
hood	O
.	O
</s>
<s>
With	O
DOS	O
,	O
the	O
first	O
track	O
of	O
a	O
floppy	B-Device
disk	I-Device
is	O
used	O
to	O
store	O
system	O
information	O
.	O
</s>
<s>
Track0	B-Application
tries	O
to	O
work	O
around	O
this	O
limitation	O
.	O
</s>
<s>
While	O
it	O
was	O
the	O
first	O
program	O
of	O
its	O
kind	O
,	O
Track0	B-Application
entered	O
the	O
game	O
when	O
the	O
use	O
of	O
floppy	B-Device
disks	I-Device
had	O
already	O
declined	O
.	O
</s>
<s>
Even	O
so	O
,	O
a	O
plethora	O
of	O
similar	O
programs	O
appeared	O
shortly	O
after	O
the	O
release	O
of	O
Track0	B-Application
.	O
</s>
