<s>
The	O
Commodore	B-Device
8050	I-Device
,	O
Commodore	B-Device
8250	I-Device
,	O
and	O
Commodore	B-Device
SFD-1001	I-Device
are	O
5¼-inch	O
floppy	B-Device
disk	I-Device
drives	I-Device
manufactured	O
by	O
Commodore	O
International	O
,	O
primarily	O
for	O
its	O
8-bit	O
CBM	B-Device
and	O
PET	B-Device
series	O
of	O
computers	O
.	O
</s>
<s>
All	O
three	O
models	O
utilize	O
5¼-inch	O
double-density	O
floppy	B-Device
disks	I-Device
with	O
a	O
track	O
spacing	O
of	O
100	O
tracks-per-inch	O
,	O
for	O
a	O
total	O
of	O
77	O
logical	O
tracks	O
per	O
side	O
.	O
</s>
<s>
Data	O
is	O
encoded	O
using	O
Commodore	O
's	O
proprietary	O
group	B-Device
coded	I-Device
recording	I-Device
scheme	O
.	O
</s>
<s>
Like	O
most	O
other	O
Commodore	O
disk	O
drives	O
,	O
these	O
drives	O
utilize	O
zone	B-Architecture
bit	I-Architecture
recording	I-Architecture
to	O
maintain	O
an	O
average	B-Device
bit	I-Device
density	I-Device
across	O
the	O
entire	O
disk	O
.	O
</s>
<s>
The	O
8050	O
is	O
a	O
single-sided	O
drive	O
,	O
whereas	O
the	O
8250	O
and	O
SFD-1001	B-Device
are	O
dual-sided	O
drives	O
.	O
</s>
<s>
Both	O
the	O
8050	O
and	O
8250	O
are	O
housed	O
in	O
a	O
dual-drive	O
case	O
similar	O
to	O
the	O
Commodore	B-Device
4040	I-Device
drive	O
.	O
</s>
<s>
The	O
SFD-1001	B-Device
is	O
housed	O
in	O
a	O
single-drive	O
case	O
similar	O
to	O
the	O
Commodore	B-Device
1541	I-Device
.	O
</s>
<s>
The	O
8250LP	O
,	O
a	O
low-profile	O
revision	O
of	O
the	O
8250	O
,	O
is	O
housed	O
in	O
a	O
shorter	O
dual-drive	O
case	O
that	O
is	O
stylistically	O
similar	O
to	O
the	O
SFD-1001	B-Device
.	O
</s>
<s>
These	O
drives	O
are	O
not	O
dual-mode	O
,	O
so	O
they	O
cannot	O
read	O
or	O
write	O
5¼-inch	B-Device
disks	I-Device
formatted	O
by	O
lower-capacity	O
48-tpi	O
models	O
,	O
such	O
as	O
the	O
Commodore	B-Device
1541	I-Device
or	O
4040	O
.	O
</s>
<s>
They	O
also	O
cannot	O
read	O
or	O
write	O
5¼-inch	B-Device
disks	I-Device
formatted	O
by	O
96-tpi	O
drives	O
,	O
such	O
as	O
the	O
640	O
kilobyte	O
IBM	O
PC	O
disk	O
or	O
880	O
kilobyte	O
Commodore	B-Device
Amiga	I-Device
disk	O
,	O
due	O
to	O
the	O
minor	O
difference	O
in	O
track	O
spacing	O
.	O
</s>
<s>
Lastly	O
,	O
they	O
cannot	O
read	O
or	O
write	O
high-density	O
5¼-inch	B-Device
disks	I-Device
due	O
to	O
both	O
the	O
difference	O
in	O
track	O
spacing	O
and	O
the	O
difference	O
in	O
write	O
head	O
coercivity	O
(	O
300-oersted	O
for	O
double-density	O
,	O
600-oersted	O
for	O
high-density	O
)	O
.	O
</s>
