<s>
The	O
Commodore	B-Device
2031	I-Device
and	O
Commodore	B-Device
4031	I-Device
are	O
single-unit	O
5¼	O
"	O
floppy	B-Device
disk	I-Device
drives	I-Device
for	O
Commodore	O
International	O
computers	O
.	O
</s>
<s>
They	O
use	O
a	O
similar	O
steel	O
case	O
form	O
to	O
the	O
Commodore	B-Device
9060/9090	I-Device
hard	B-Device
disk	I-Device
drives	I-Device
,	O
and	O
use	O
the	O
parallel	O
IEEE-488	O
interface	O
common	O
to	O
Commodore	B-Device
PET/CBM	I-Device
computers	O
.	O
</s>
<s>
Essentially	O
,	O
both	O
models	O
are	O
a	O
single-drive	O
version	O
of	O
the	O
Commodore	B-Device
2040/4040	I-Device
units	O
.	O
</s>
<s>
The	O
Commodore	B-Device
2031LP	I-Device
is	O
functionally	O
the	O
same	O
as	O
the	O
2031	O
,	O
but	O
used	O
the	O
lower-profile	O
tan	O
case	O
of	O
the	O
second	O
version	O
of	O
the	O
Commodore	B-Device
1540	I-Device
floppy	B-Device
disk	I-Device
drive	I-Device
intended	O
for	O
home	O
computer	O
use	O
.	O
</s>
<s>
These	O
drive	O
models	O
use	O
a	O
single-density	O
,	O
single-side	O
floppy	B-Device
data	O
storage	O
format	O
similar	O
to	O
that	O
used	O
by	O
the	O
Commodore	B-Device
1540	I-Device
&	O
Commodore	B-Device
1541	I-Device
drives	O
,	O
but	O
with	O
a	O
slightly	O
different	O
data	O
marker	O
indicating	O
which	O
model	O
originally	O
formatted	O
the	O
disk	O
.	O
</s>
