<s>
Disk	B-Application
Utility	I-Application
is	O
a	O
system	O
utility	B-Application
for	O
performing	O
disk	B-Device
and	O
disk	B-Device
volume-related	O
tasks	O
on	O
the	O
macOS	B-Application
operating	B-General_Concept
system	I-General_Concept
by	O
Apple	O
Inc	O
.	O
</s>
<s>
The	O
functions	O
currently	O
supported	O
by	O
Disk	B-Application
Utility	I-Application
include	O
:	O
</s>
<s>
Disk	B-Application
Utility	I-Application
functions	O
may	O
also	O
be	O
accessed	O
from	O
the	O
macOS	B-Application
command	B-Application
line	I-Application
with	O
the	O
diskutil	O
and	O
hdiutil	O
commands	O
.	O
</s>
<s>
It	O
is	O
also	O
possible	O
to	O
create	O
and	O
manage	O
RAM	B-Application
disk	I-Application
images	O
by	O
using	O
hdiutil	O
and	O
diskutil	O
in	O
terminal	O
.	O
</s>
<s>
In	O
the	O
classic	B-Application
Mac	I-Application
OS	I-Application
,	O
similar	O
functionality	O
to	O
the	O
verification	O
features	O
of	O
Disk	B-Application
Utility	I-Application
could	O
be	O
found	O
in	O
the	O
Disk	B-Operating_System
First	I-Operating_System
Aid	I-Operating_System
application	O
.	O
</s>
<s>
Another	O
application	O
called	O
Drive	O
Setup	O
was	O
used	O
for	O
drive	O
formatting	B-Application
and	O
partitioning	B-Application
and	O
the	O
application	O
Disk	B-Operating_System
Copy	I-Operating_System
was	O
used	O
for	O
working	O
with	O
disk	B-Application
images	I-Application
.	O
</s>
<s>
Before	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
Panther	I-Operating_System
,	O
the	O
functionality	O
of	O
Disk	B-Application
Utility	I-Application
was	O
spread	O
across	O
two	O
applications	O
:	O
Disk	B-Operating_System
Copy	I-Operating_System
and	O
Disk	B-Application
Utility	I-Application
.	O
</s>
<s>
Disk	B-Operating_System
Copy	I-Operating_System
was	O
used	O
for	O
creating	O
and	O
mounting	B-Application
disk	B-Application
image	I-Application
files	O
whereas	O
Disk	B-Application
Utility	I-Application
was	O
used	O
for	O
formatting	B-Application
,	O
partitioning	B-Application
,	O
verifying	O
,	O
and	O
repairing	O
file	O
structures	O
.	O
</s>
<s>
The	O
ability	O
to	O
"	O
zero	O
"	O
all	O
data	O
(	O
multi-pass	O
formatting	B-Application
)	O
on	O
a	O
disk	B-Device
was	O
not	O
added	O
until	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
10.2.3	I-Operating_System
.	O
</s>
<s>
Further	O
changes	O
introduced	O
in	O
Mac	B-Application
OS	I-Application
X	I-Application
Tiger	I-Application
,	O
specifically	O
version	O
10.4.3	O
,	O
allowed	O
Disk	B-Application
Utility	I-Application
to	O
be	O
used	O
to	O
verify	O
the	O
file	O
structure	O
of	O
the	O
current	O
boot	O
drive	O
.	O
</s>
<s>
Mac	B-Application
OS	I-Application
X	I-Application
Leopard	I-Application
added	O
the	O
ability	O
to	O
create	O
,	O
resize	O
,	O
and	O
delete	O
disk	B-Application
partitions	I-Application
without	O
erasing	O
them	O
,	O
a	O
feature	O
known	O
as	O
live	O
partitioning	B-Application
.	O
</s>
<s>
In	O
OS	B-Operating_System
X	I-Operating_System
El	I-Operating_System
Capitan	I-Operating_System
,	O
Disk	B-Application
Utility	I-Application
has	O
a	O
different	O
user	B-Application
interface	I-Application
and	O
lost	O
the	O
abilities	O
to	O
repair	B-Operating_System
permissions	I-Operating_System
due	O
to	O
obsolescence	O
,	O
create	O
and	O
manage	O
disks	B-Language
formatted	O
as	O
RAID	B-Architecture
,	O
burn	O
discs	O
,	O
and	O
multi-pass	O
format	O
internal	O
solid-state	B-Device
drives	I-Device
and	O
encrypted	O
external	O
drives	O
.	O
</s>
