<s>
A	O
Memory	B-Application
Technology	I-Application
Device	I-Application
(	O
MTD	O
)	O
is	O
a	O
type	O
of	O
device	O
file	O
in	O
Linux	B-Application
for	O
interacting	O
with	O
flash	B-Device
memory	I-Device
.	O
</s>
<s>
The	O
MTD	O
subsystem	O
was	O
created	O
to	O
provide	O
an	O
abstraction	B-Architecture
layer	I-Architecture
between	O
the	O
hardware-specific	O
device	O
drivers	O
and	O
higher-level	O
applications	O
.	O
</s>
<s>
Although	O
character	O
and	O
block	O
device	O
files	O
already	O
existed	O
,	O
their	O
semantics	O
do	O
n't	O
map	O
well	O
to	O
the	O
way	O
that	O
flash	B-Device
memory	I-Device
devices	O
operate	O
.	O
</s>
<s>
USB	O
sticks	O
,	O
MMCs	O
,	O
SDs	O
,	O
CompactFlashes	B-Device
and	O
other	O
popular	O
removable	O
devices	O
are	O
not	O
MTDs	O
.	O
</s>
<s>
Although	O
they	O
contain	O
flash	B-Device
memory	I-Device
,	O
this	O
is	O
hidden	O
behind	O
a	O
block	O
device	O
interface	O
using	O
a	O
Flash	O
Translation	O
Layer	O
and	O
not	O
directly	O
interfacing	O
with	O
the	O
OS	O
.	O
</s>
<s>
When	O
using	O
an	O
MTD	O
,	O
the	O
use	O
of	O
an	O
MTD	O
aware	O
file	O
system	O
such	O
as	O
UBIFS	B-Application
,	O
JFFS2	B-Application
or	O
YAFFS	B-Application
is	O
recommended	O
.	O
</s>
<s>
MTDs	O
do	O
n't	O
address	O
to	O
the	O
OS	O
like	O
traditional	O
storage	O
devices	O
(	O
Solid	B-Device
State	I-Device
Drive	I-Device
,	O
Hard	B-Device
Disk	I-Device
Drive	I-Device
...	O
)	O
using	O
LBAs	O
,	O
but	O
rather	O
using	O
offsets	O
and	O
sizes	O
.	O
</s>
