<s>
File	B-General_Concept
size	I-General_Concept
is	O
a	O
measure	O
of	O
how	O
much	O
data	B-General_Concept
a	O
computer	B-Operating_System
file	I-Operating_System
contains	O
or	O
,	O
alternately	O
,	O
how	O
much	O
storage	B-General_Concept
it	O
consumes	O
.	O
</s>
<s>
Typically	O
,	O
file	B-General_Concept
size	I-General_Concept
is	O
expressed	O
in	O
units	O
of	O
measurement	O
based	O
on	O
the	O
byte	B-Application
.	O
</s>
<s>
By	O
convention	O
,	O
file	B-General_Concept
size	I-General_Concept
units	O
use	O
either	O
a	O
metric	O
prefix	O
(	O
as	O
in	O
megabyte	O
and	O
gigabyte	O
)	O
or	O
a	O
binary	O
prefix	O
(	O
as	O
in	O
mebibyte	O
and	O
gibibyte	O
)	O
.	O
</s>
<s>
When	O
a	O
file	O
is	O
written	O
to	O
a	O
file	B-Application
system	I-Application
,	O
which	O
is	O
the	O
case	O
in	O
most	O
modern	O
devices	O
,	O
it	O
may	O
consume	O
slightly	O
more	O
disk	B-General_Concept
space	I-General_Concept
than	O
the	O
file	O
requires	O
.	O
</s>
<s>
This	O
is	O
because	O
the	O
file	B-Application
system	I-Application
rounds	O
the	O
size	O
up	O
to	O
include	O
any	O
unused	O
space	O
left	O
over	O
in	O
the	O
last	O
disk	B-Application
sector	I-Application
used	O
by	O
the	O
file	O
.	O
</s>
<s>
(	O
A	O
sector	O
is	O
the	O
smallest	O
amount	O
of	O
space	O
addressable	O
by	O
the	O
file	B-Application
system	I-Application
.	O
</s>
<s>
The	O
size	O
of	O
a	O
disk	B-Application
sector	I-Application
ranges	O
from	O
several	O
hundred	O
to	O
several	O
thousand	O
bytes	B-Application
.	O
)	O
</s>
<s>
Although	O
smaller	O
sector	O
sizes	O
allow	O
for	O
denser	O
use	O
of	O
disk	B-General_Concept
space	I-General_Concept
,	O
they	O
decrease	O
the	O
operational	O
efficiency	O
of	O
the	O
file	B-Application
system	I-Application
.	O
</s>
<s>
The	O
maximum	O
file	B-General_Concept
size	I-General_Concept
a	O
file	B-Application
system	I-Application
supports	O
depends	O
not	O
only	O
on	O
the	O
capacity	O
of	O
the	O
file	B-Application
system	I-Application
,	O
but	O
also	O
on	O
the	O
number	O
of	O
bits	O
reserved	O
for	O
the	O
storage	B-General_Concept
of	O
file	B-General_Concept
size	I-General_Concept
information	O
.	O
</s>
<s>
The	O
maximum	O
file	B-General_Concept
size	I-General_Concept
in	O
the	O
FAT32	B-Application
file	B-Application
system	I-Application
,	O
for	O
example	O
,	O
is	O
4,294,967,295	O
bytes	B-Application
,	O
which	O
is	O
one	O
byte	B-Application
less	O
than	O
four	O
gigabytes	O
.	O
</s>
<s>
The	O
table	O
below	O
details	O
the	O
maximum	O
file	B-General_Concept
size	I-General_Concept
for	O
a	O
number	O
of	O
common	O
or	O
historical	O
file	B-Application
systems	I-Application
.	O
</s>
<s>
Bytes	B-Application
are	O
the	O
typical	O
base	O
unit	O
of	O
information	O
.	O
</s>
<s>
While	O
these	O
larger	O
units	O
are	O
not	O
as	O
accurate	O
as	O
the	O
byte	B-Application
size	O
,	O
most	O
operating	O
systems	O
will	O
expose	O
the	O
true	O
byte	B-Application
size	O
of	O
a	O
file	O
by	O
inspecting	O
the	O
file	O
properties	O
directly	O
.	O
</s>
<s>
Command	O
line	O
tools	O
can	O
also	O
expose	O
the	O
exact	O
byte	B-Application
size	O
as	O
well	O
.	O
</s>
<s>
A	O
file	B-Application
system	I-Application
may	O
display	O
all	O
sizes	O
with	O
the	O
metric	O
system	O
with	O
only	O
'	O
kB	O
 '	O
on	O
small	O
files	O
indicating	O
it	O
,	O
while	O
some	O
file	O
systems/operating	O
systems	O
would	O
display	O
sizes	O
in	O
,	O
the	O
traditionally	O
used	O
on	O
computers	O
,	O
binary	O
system	O
for	O
all	O
sizes	O
,	O
e.g.	O
</s>
<s>
GB	O
=	O
1,000,000,000	O
bytes	B-Application
and	O
TB	O
=	O
1000	O
GB	O
)	O
.	O
</s>
<s>
Sometimes	O
kB	O
,	O
with	O
lower	O
cased	O
SI-prefix	O
'	O
k-	O
'	O
for	O
kilo	O
(	O
1000	O
)	O
,	O
is	O
used	O
,	O
then	O
always	O
equaling	O
1000	O
bytes	B-Application
.	O
</s>
<s>
"	O
downloads	O
"	O
)	O
may	O
use	O
rates	O
of	O
units	O
of	O
bytes	B-Application
(	O
e.g.	O
</s>
