<s>
The	O
IBM	B-Device
eXtended	I-Device
Density	I-Device
Format	I-Device
(	O
XDF	O
)	O
is	O
a	O
way	O
of	O
superformatting	B-Device
standard	O
high-density	O
3½-inch	O
and	O
5¼-inch	O
floppy	B-Device
disks	I-Device
to	O
larger-than-standard	O
capacities	O
.	O
</s>
<s>
It	O
is	O
supported	O
natively	O
by	O
IBM	O
's	O
PC	B-Operating_System
DOS	I-Operating_System
versions	O
7	O
and	O
2000	O
and	O
by	O
OS/2	B-Application
Warp3	O
onward	O
,	O
using	O
the	O
XDF	O
and	O
XDFCOPY	O
commands	O
(	O
directly	O
in	O
OS/2	B-Application
)	O
.	O
</s>
<s>
When	O
formatted	O
as	O
XDF	O
disks	O
,	O
3½-inch	O
floppies	B-Device
can	O
hold	O
1860kB	O
,	O
and	O
5¼-inch	O
floppies	B-Device
can	O
hold	O
1540kB	O
,	O
using	O
different	O
number	O
of	O
sectors	O
as	O
well	O
as	O
different	O
sector	O
size	O
per	O
track	O
(	O
not	O
all	O
sectors	O
in	O
the	O
same	O
track	O
are	O
of	O
the	O
same	O
size	O
)	O
.	O
</s>
<s>
However	O
,	O
the	O
first	O
cylinder	O
uses	O
standard	O
formatting	O
,	O
providing	O
a	O
small	O
FAT12	B-Application
section	O
that	O
can	O
be	O
accessed	O
without	O
XDF	O
support	O
and	O
on	O
which	O
can	O
be	O
put	O
a	O
ReadMe	O
file	O
or	O
the	O
XDF	O
drivers	O
.	O
</s>
<s>
Floppy	B-Device
distributions	O
of	O
OS/2	B-Application
3.0	O
,	O
PC	B-Operating_System
DOS	I-Operating_System
7	O
and	O
onward	O
used	O
XDF	O
formatting	O
for	O
most	O
of	O
the	O
media	O
set	O
.	O
</s>
<s>
Floppy	B-Device
disks	I-Device
formatted	O
using	O
XDF	O
can	O
only	O
be	O
read	O
in	O
floppy	B-Device
disk	I-Device
drives	I-Device
that	O
are	O
attached	O
directly	O
to	O
the	O
system	O
by	O
way	O
of	O
an	O
FDC	B-Device
.	O
</s>
<s>
Thus	O
,	O
USB	B-Protocol
attached	O
floppy	B-Device
drives	I-Device
cannot	O
read	O
XDF	O
formatted	O
media	O
.	O
</s>
