<s>
RDX	O
is	O
a	O
disk-based	O
removable	B-Device
storage	I-Device
format	O
developed	O
by	O
ProStor	O
Systems	O
Incorporated	O
in	O
2004	O
.	O
</s>
<s>
RDX	O
is	O
intended	O
as	O
a	O
replacement	O
of	O
tape	B-Architecture
storage	I-Architecture
.	O
</s>
<s>
RDX	O
removable	B-Device
disk	I-Device
technology	I-Device
consists	O
of	O
portable	O
disk	O
cartridges	O
and	O
an	O
RDX	O
dock	O
.	O
</s>
<s>
RDX	O
cartridges	O
are	O
shock-proof	O
2.5-inch	O
Serial	O
ATA	O
hard	B-Device
disk	I-Device
drives	I-Device
and	O
are	O
advertised	O
to	O
sustain	O
a	O
drop	O
onto	O
a	O
concrete	O
floor	O
and	O
to	O
offer	O
an	O
archival	O
lifetime	O
up	O
to	O
30	O
years	O
and	O
transfer	O
up	O
to	O
650GB/hr	O
.	O
</s>
<s>
Hard	B-Device
disk	I-Device
cartridges	I-Device
capacities	O
are	O
320	O
GB	O
,	O
500	O
GB	O
,	O
1	O
TB	O
,	O
1.5	O
TB	O
,	O
2	O
TB	O
,	O
3	O
TB	O
,	O
4	O
TB	O
,	O
and	O
5	O
TB	O
.	O
</s>
<s>
Solid-state	B-Device
cartridges	I-Device
 '	I-Device
capacities	O
run	O
from	O
64	O
GB	O
to	O
512	O
GB	O
per	O
medium	O
,	O
doubling	O
each	O
increment	O
;	O
or	O
as	O
WORM	B-Device
media	O
from	O
320	O
GB	O
to	O
1	O
TB	O
.	O
</s>
<s>
RDX	O
is	O
sometimes	O
compared	O
with	O
Iomega	B-Device
REV	I-Device
,	O
a	O
formerly	O
competing	O
technology	O
.	O
</s>
<s>
However	O
REV	B-Device
places	O
the	O
read/write	O
heads	O
in	O
the	O
drive	O
instead	O
of	O
inside	O
the	O
cartridge	O
,	O
which	O
means	O
that	O
the	O
drive	O
's	O
loading/unloading	O
mechanism	O
must	O
mechanically	O
insert	O
heads	O
into	O
and	O
remove	O
them	O
from	O
the	O
cartridge	O
through	O
a	O
physical	O
hole	O
.	O
</s>
