<s>
A	O
fuzzy	B-Device
bit	I-Device
,	O
also	O
known	O
as	O
a	O
flaky	O
bit	O
or	O
a	O
weak	O
bit	O
,	O
is	O
a	O
bit	O
cell	O
on	O
a	O
digital	B-General_Concept
storage	I-General_Concept
medium	O
that	O
possesses	O
no	O
clear	O
digital	O
state	O
.	O
</s>
<s>
A	O
fuzzy	B-Device
bit	I-Device
may	O
be	O
an	O
unwanted	O
side	O
effect	O
of	O
a	O
defective	O
storage	B-General_Concept
medium	I-General_Concept
or	O
reader	O
,	O
but	O
can	O
also	O
be	O
a	O
deliberately	O
generated	O
effect	O
.	O
</s>
<s>
For	O
example	O
,	O
in	O
the	O
1980s	O
and	O
1990s	O
,	O
with	O
magnetic	B-General_Concept
media	I-General_Concept
such	O
as	O
floppy	B-Device
disks	I-Device
such	O
bits	O
were	O
deliberately	O
created	O
by	O
poor	O
formatting	B-Application
to	O
serve	O
as	O
a	O
copy	B-Application
protection	I-Application
mechanism	O
.	O
</s>
<s>
An	O
example	O
of	O
this	O
is	O
the	O
game	O
Dungeon	B-Device
Master	I-Device
,	O
in	O
which	O
inconsistency	O
in	O
multiple	O
read	O
access	O
to	O
such	O
a	O
bit	O
was	O
checked	O
when	O
loading	O
the	O
software	O
and	O
was	O
a	O
prerequisite	O
for	O
operation	O
.	O
</s>
<s>
Since	O
usual	O
floppy	B-Device
disk	I-Device
drives	I-Device
could	O
not	O
produce	O
such	O
bits	O
,	O
this	O
was	O
an	O
effective	O
mechanism	O
for	O
preventing	O
illegal	O
copies	O
and	O
one	O
of	O
the	O
only	O
possible	O
approaches	O
to	O
circumvent	O
such	O
protection	O
was	O
to	O
disable	O
the	O
check	O
routine	O
in	O
the	O
software	O
.	O
</s>
