<s>
A	O
flash	B-Device
drive	I-Device
is	O
a	O
portable	O
computer	O
drive	O
that	O
uses	O
flash	B-Device
memory	I-Device
.	O
</s>
<s>
Flash	B-Device
drives	I-Device
are	O
the	O
larger	O
memory	O
modules	O
consisting	O
of	O
a	O
number	O
of	O
flash	B-Device
chips	I-Device
.	O
</s>
<s>
A	O
flash	B-Device
chip	I-Device
is	O
used	O
to	O
read	O
the	O
contents	O
of	O
a	O
single	O
cell	O
,	O
but	O
it	O
can	O
write	O
entire	O
block	O
of	O
cells	O
.	O
</s>
<s>
Memory	B-Device
cards	I-Device
:	O
</s>
