<s>
Extent	B-Operating_System
File	I-Operating_System
System	I-Operating_System
(	O
EFS	B-Operating_System
)	O
is	O
an	O
older	O
extent-based	O
file	B-Application
system	I-Application
used	O
in	O
IRIX	B-Operating_System
releases	O
prior	O
to	O
version	O
5.3	O
.	O
</s>
<s>
It	O
has	O
been	O
superseded	O
by	O
XFS	B-Application
.	O
</s>
