<s>
Apple	B-Operating_System
Software	I-Operating_System
Restore	I-Operating_System
or	O
asr	B-Operating_System
is	O
a	O
command	B-Application
line	I-Application
utility	B-Application
in	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
used	O
to	O
apply	O
a	O
DMG	O
disk	B-Application
image	I-Application
to	O
a	O
selected	O
partition	O
or	O
mount	O
point	O
on	O
a	O
file	B-Application
system	I-Application
.	O
</s>
<s>
It	O
is	O
often	O
used	O
for	O
cloning	O
large	O
numbers	O
of	O
Macintosh	B-Device
computers	O
.	O
</s>
<s>
Apple	B-Operating_System
Software	I-Operating_System
Restore	I-Operating_System
can	O
read	O
an	O
image	O
locally	O
or	O
from	O
a	O
server	O
via	O
HTTP	B-Protocol
or	O
its	O
own	O
multicast	O
asr://	O
URI	B-Protocol
.	O
</s>
<s>
asr	B-Operating_System
has	O
two	O
methods	O
it	O
can	O
use	O
to	O
restore	O
an	O
image	O
to	O
a	O
volume	O
:	O
it	O
can	O
either	O
copy	O
items	O
in	O
a	O
file-by-file	O
mode	O
,	O
or	O
it	O
can	O
directly	O
block-copy	O
the	O
image	O
.	O
</s>
<s>
As	O
the	O
latter	O
method	O
does	O
not	O
need	O
to	O
go	O
through	O
the	O
OS	O
filesystem	B-Application
,	O
it	O
is	O
much	O
faster	O
,	O
typically	O
being	O
limited	O
only	O
by	O
the	O
speed	O
of	O
the	O
drives	O
or	O
network	O
connections	O
involved	O
.	O
</s>
<s>
The	O
graphical	O
Disk	B-Application
Utility	I-Application
uses	O
asr	B-Operating_System
processes	O
in	O
the	O
background	O
to	O
perform	O
restores	O
.	O
</s>
