<s>
In	O
computing	O
,	O
recover	O
is	O
a	O
primitive	O
file	B-Application
system	I-Application
error	O
recovery	O
utility	O
included	O
in	O
MS-DOS	B-Application
/	O
IBM	B-Operating_System
PC	I-Operating_System
DOS	I-Operating_System
versions	O
prior	O
to	O
DOS	O
6.0	O
and	O
a	O
number	O
of	O
other	O
operating	B-General_Concept
systems	I-General_Concept
.	O
</s>
<s>
recover	O
proceeded	O
under	O
the	O
assumption	O
that	O
all	O
directory	B-Application
information	O
included	O
on	O
a	O
disk	O
or	O
disk	B-Application
partition	I-Application
was	O
hopelessly	O
corrupted	O
,	O
but	O
that	O
the	O
FAT	B-Application
and	O
non-directory	O
areas	O
might	O
still	O
contain	O
useful	O
information	O
(	O
though	O
there	O
might	O
be	O
additional	O
bad	O
disk	B-Application
sectors	I-Application
not	O
recorded	O
in	O
the	O
FAT	B-Application
)	O
.	O
</s>
<s>
The	O
program	O
removed	O
all	O
subdirectories	B-Application
and	O
all	O
entries	O
in	O
the	O
root	B-Application
directory	I-Application
,	O
and	O
then	O
created	O
new	O
files	O
with	O
names	O
such	O
as	O
""	O
in	O
the	O
root	B-Application
directory	I-Application
,	O
corresponding	O
to	O
the	O
valid	O
allocation	O
chains	O
that	O
were	O
found	O
in	O
the	O
FAT	B-Application
area	O
(	O
excluding	O
disk	O
clusters	O
that	O
were	O
tested	O
and	O
found	O
to	O
have	O
hardware	O
errors	O
)	O
.	O
</s>
<s>
A	O
formerly	O
bootable	B-Operating_System
disk	I-Operating_System
would	O
no	O
longer	O
be	O
bootable	O
after	O
recover	O
had	O
executed	O
.	O
</s>
<s>
In	O
DOS	O
version	O
5	O
,	O
another	O
mode	O
of	O
operation	O
was	O
added	O
:	O
specifying	O
a	O
single	O
filename	B-Device
on	O
the	O
command	B-Application
line	I-Application
would	O
cause	O
the	O
program	O
to	O
test	O
all	O
the	O
disk	B-Application
sectors	I-Application
used	O
to	O
store	O
the	O
file	O
,	O
and	O
shorten	O
the	O
file	O
by	O
omitting	O
sectors	O
which	O
tested	O
bad	O
.	O
</s>
<s>
DR	B-Application
DOS	I-Application
6.0	O
includes	O
an	O
implementation	O
of	O
the	O
command	B-Application
.	O
</s>
<s>
The	O
command	B-Application
is	O
also	O
available	O
on	O
SISNE	B-Operating_System
plus	I-Operating_System
and	O
IBM	B-Application
OS/2	I-Application
.	O
</s>
<s>
The	O
FreeDOS	B-Application
version	O
was	O
developed	O
by	O
Imre	O
Leber	O
and	O
is	O
licensed	O
under	O
the	O
GPL	B-License
.	O
</s>
