<s>
REV	B-Device
is	O
a	O
removable	O
hard	B-Device
disk	I-Device
storage	I-Device
system	O
from	O
Iomega	O
.	O
</s>
<s>
The	O
small	O
removable	O
disks	O
store	O
35	O
,	O
70	O
,	O
or	O
120	O
gigabytes	O
(	O
GB	O
)	O
and	O
are	O
hard-drive	B-Device
technology	O
.	O
</s>
<s>
Like	O
a	O
standard	O
hard	B-Device
drive	I-Device
,	O
the	O
REV	B-Device
system	O
uses	O
a	O
flying	O
head	O
to	O
read	O
and	O
write	O
data	O
to	O
a	O
spinning	O
platter	O
.	O
</s>
<s>
The	O
removable	O
disks	O
contained	O
the	O
platter	O
,	O
spindle	O
,	O
and	O
motor	O
,	O
while	O
the	O
drive	O
heads	O
and	O
drive	O
controller	O
are	O
contained	O
within	O
the	O
REV	B-Device
drive	I-Device
.	O
</s>
<s>
The	O
REV	B-Device
was	O
available	O
as	O
an	O
external	O
desktop	O
model	O
with	O
FireWire	B-Protocol
,	O
SCSI	B-Architecture
or	O
USB	O
2.0	O
interfaces	O
,	O
an	O
internal	O
model	O
with	O
SCSI	B-Architecture
,	O
ATAPI	O
,	O
or	O
SATA	O
interfaces	O
,	O
or	O
an	O
external	O
server	O
model	O
which	O
features	O
a	O
cartridge	O
autoloader	O
and	O
SCSI	B-Architecture
interface	O
.	O
</s>
<s>
Iomega	O
also	O
offered	O
a	O
320	O
GB	O
network-attached	B-Application
storage	I-Application
appliance	O
which	O
features	O
a	O
built-in	O
REV	B-Device
.	O
</s>
<s>
The	O
drives	O
are	O
compatible	O
with	O
Macintosh	B-Device
,	O
Windows	B-Application
,	O
and	O
Linux	B-Application
operating	I-Application
systems	I-Application
,	O
although	O
some	O
only	O
with	O
particular	O
models	O
or	O
interfaces	O
.	O
</s>
<s>
This	O
product	O
,	O
especially	O
the	O
server	O
model	O
,	O
was	O
marketed	O
as	O
a	O
replacement	O
of	O
tape	O
drive	O
technology	O
for	O
enterprise	O
data	B-Protocol
backup	I-Protocol
,	O
with	O
claims	O
of	O
higher	O
reliability	O
,	O
greater	O
speed	O
,	O
and	O
random	B-General_Concept
access	I-General_Concept
capability	O
.	O
</s>
<s>
The	O
REV	B-Device
was	O
in	O
many	O
ways	O
a	O
successor	O
to	O
Iomega	O
's	O
Jaz	B-Device
drive	I-Device
,	O
which	O
uses	O
a	O
similar	O
removable	O
hard-disk-platter	O
concept	O
.	O
</s>
<s>
In	O
some	O
circles	O
,	O
REV	B-Device
drives	I-Device
are	O
referred	O
to	O
as	O
"	O
RRD	O
,	O
"	O
for	O
"	O
Removable	O
Rigid	O
Disk	O
,	O
"	O
because	O
SCSI	B-Architecture
REV	B-Device
drives	I-Device
identify	O
themselves	O
as	O
"	O
RRD	O
"	O
drives	O
to	O
the	O
host	O
OS	O
.	O
</s>
<s>
The	O
disks	O
are	O
formatted	O
with	O
the	O
UDF	O
file	B-Application
system	I-Application
on	O
Windows	B-Application
and	O
Unix/Linux	O
.	O
</s>
<s>
On	O
Apple	O
systems	O
,	O
they	O
may	O
be	O
formatted	O
as	O
HFS+	B-Application
or	O
UDF	O
in	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
.	O
</s>
<s>
A	O
seemingly-similar	O
competing	O
technology	O
is	O
RDX	B-Device
Technology	I-Device
.	O
</s>
<s>
A	O
key	O
distinction	O
,	O
however	O
,	O
is	O
that	O
the	O
REV	B-Device
drive	I-Device
heads	O
and	O
drive	O
controller	O
remain	O
inside	O
the	O
drive	O
when	O
the	O
hard-disk	B-Device
platter	O
is	O
removed	O
from	O
it	O
.	O
</s>
<s>
In	O
RDX	B-Device
Technology	I-Device
,	O
the	O
drive	O
heads	O
are	O
contained	O
within	O
the	O
cartridge	O
along	O
with	O
the	O
platter	O
and	O
are	O
removed	O
along	O
with	O
it	O
.	O
</s>
<s>
Faced	O
with	O
cheaper	O
,	O
smaller	O
,	O
higher	O
capacity	O
and	O
more	O
reliable	O
USB	O
2.5	O
"	O
portable	O
hard	B-Device
drives	I-Device
,	O
the	O
REV	B-Device
format	O
was	O
discontinued	O
:	O
</s>
