<s>
A	O
memory	B-Device
card	I-Device
reader	I-Device
is	O
a	O
device	O
for	O
accessing	O
the	O
data	O
on	O
a	O
memory	B-Device
card	I-Device
such	O
as	O
a	O
CompactFlash	B-Device
(	O
CF	B-Device
)	O
,	O
Secure	B-Device
Digital	I-Device
(	O
SD	O
)	O
or	O
MultiMediaCard	O
(	O
MMC	O
)	O
.	O
</s>
<s>
Most	O
card	B-Device
readers	I-Device
also	O
offer	O
write	O
capability	O
,	O
and	O
together	O
with	O
the	O
card	O
,	O
this	O
can	O
function	O
as	O
a	O
pen	O
drive	O
.	O
</s>
<s>
Some	O
printers	O
and	O
Smartphones	B-Application
have	O
a	O
built-in	O
card	B-Device
reader	I-Device
,	O
as	O
do	O
most	O
personal	B-Device
computers	I-Device
and	O
the	O
majority	O
of	O
Tablet	B-Device
computers	I-Device
.	O
</s>
<s>
A	O
multi	O
card	B-Device
reader	I-Device
is	O
used	O
for	O
communication	O
with	O
more	O
than	O
one	O
type	O
of	O
flash	B-Device
memory	I-Device
card	I-Device
.	O
</s>
<s>
Multi	O
card	B-Device
readers	I-Device
do	O
not	O
have	O
built-in	O
memory	O
capacity	O
,	O
but	O
are	O
able	O
to	O
accept	O
multiple	O
types	O
and	O
styles	O
of	O
memory	B-Device
cards	I-Device
.	O
</s>
<s>
Memory	B-Device
card	I-Device
readers	I-Device
,	O
unlike	O
smartphones	B-Application
,	O
telephones	O
and	O
other	O
devices	O
,	O
such	O
as	O
cameras	O
and	O
digital	O
cameras	O
,	O
allow	O
formatting	O
in	O
a	O
file	O
system	O
other	O
than	O
FAT	O
(	O
FAT16	O
,	O
FAT32	O
,	O
exFAT	O
)	O
to	O
NTFS	O
in	O
Windows	O
,	O
ext	O
,	O
ext2	O
,	O
ext3	O
in	O
Linux	O
or	O
HFS	O
,	O
HFS	O
+	O
for	O
Mac	O
OS	O
.	O
</s>
<s>
Smartphones	B-Application
or	O
other	O
devices	O
like	O
cameras	O
format	O
them	O
only	O
in	O
FAT	O
.	O
</s>
<s>
The	O
number	O
of	O
compatible	O
memory	B-Device
cards	I-Device
varies	O
from	O
reader	O
to	O
reader	O
and	O
can	O
include	O
more	O
than	O
20	O
different	O
types	O
.	O
</s>
<s>
The	O
number	O
of	O
different	O
memory	B-Device
cards	I-Device
that	O
a	O
multi	O
card	B-Device
reader	I-Device
can	O
accept	O
is	O
expressed	O
as	O
x-in-1	O
,	O
with	O
x	O
being	O
a	O
figure	O
of	O
merit	O
indicating	O
the	O
number	O
of	O
memory	B-Device
cards	I-Device
accepted	O
,	O
such	O
as	O
35-in-1	O
.	O
</s>
<s>
There	O
are	O
three	O
categories	O
of	O
card	B-Device
readers	I-Device
sorted	O
by	O
the	O
type	O
and	O
quantity	O
of	O
the	O
card	O
slots	O
:	O
single	O
card	B-Device
reader	I-Device
(	O
e.g.	O
</s>
<s>
1x	O
SD-only	O
)	O
,	O
multi	O
card	B-Device
reader	I-Device
(	O
e.g.	O
</s>
<s>
9-in-1	O
)	O
and	O
series	O
card	B-Device
reader	I-Device
(	O
e.g.	O
</s>
<s>
Some	O
kinds	O
of	O
memory	B-Device
cards	I-Device
with	O
their	O
own	O
USB	O
functions	O
do	O
not	O
need	O
the	O
card	B-Device
reader	I-Device
,	O
such	O
as	O
the	O
Intelligent	O
Stick	O
memory	B-Device
card	I-Device
,	O
which	O
can	O
plug	O
directly	O
into	O
a	O
USB	O
slot	O
.	O
</s>
<s>
Modern	O
UDMA-7	O
CompactFlash	B-Device
Cards	I-Device
and	O
UHS-I	O
Secure	B-Device
Digital	I-Device
cards	I-Device
provide	O
data	O
rates	O
in	O
excess	O
of	O
89	O
MB/s	O
and	O
up	O
to	O
145	O
MB/s	O
,	O
when	O
used	O
with	O
memory	B-Device
card	I-Device
readers	I-Device
capable	O
of	O
USB	O
3.0	O
data	O
transfer	O
rates	O
.	O
</s>
<s>
As	O
of	O
2011	O
,	O
Secure	B-Device
Digital	I-Device
memory	B-Device
cards	I-Device
received	O
an	O
additional	O
option	O
of	O
a	O
UHS-II	O
bus	O
interface	O
.	O
</s>
