<s>
Zeero	B-Operating_System
is	O
a	O
Tru64	B-Operating_System
UNIX	I-Operating_System
command/utility	O
that	O
zeros	O
out	O
disks	O
prior	O
to	O
rewrite	O
.	O
</s>
<s>
It	O
is	O
a	O
more	O
efficient	O
way	O
of	O
writing	O
zeros	O
to	O
a	O
disk	O
(	O
device	O
file	O
)	O
than	O
using	O
/dev/zero	B-Application
with	O
dd	B-Application
.	O
</s>
<s>
shred	B-Application
would	O
be	O
more	O
secure	O
,	O
but	O
is	O
not	O
installed	O
by	O
default	O
on	O
Tru64	B-Operating_System
systems	O
.	O
</s>
