ntfs-3g/ntfsprogs/ntfsundelete.8.in

.\" Copyright (c) 2002 Richard Russon. All Rights Reserved.
.\" This file may be copied under the terms of the GNU Public License.
.\"
.TH NTFSUNDELETE 8 "June 2002" "ntfsprogs version @VERSION@"
.SH NAME
ntfsundelete \- recover a deleted file from an NTFS volume.
.SH SYNOPSIS
.B ntfsundelete
[
.I options
]
.B device
.SH DESCRIPTION
.B ntfsundelete
has three modes of operation:
.IR scan ,
.I undelete
and
.IR copy .
.SS Scan
.PP
The default mode,
.I scan
simply reads an NTFS Volume and looks for files that have been deleted.  Then it
will print a list giving the inode number, name and size.
.SS Undelete
.PP
The
.I undelete
mode takes the files either matching the regular expression (option -m)
or  specified by the inode-expressions and recovers as much of the data
as possible.   It saves the result to another location.  Partly for
safety, but mostly because NTFS write support isn't finished.
.SS Copy
.PP
This is a wizard's option.  It will save a portion of the MFT to a file.  This
probably only be useful when debugging
.I ntfsundelete
.SS Notes
.B ntfsundelete
only ever
.B reads
from the NTFS Volume.
.B ntfsundelete
will never change the volume.
.SH CAVEATS
.SS Miracles
.B ntfsundelete
cannot perform the impossible.
.PP
When a file is deleted the MFT Record is marked as not in use and the bitmap
representing the disk usage is updated.  If the power isn't turned off
immediately, the free space, where the file used to live, may become
overwritten.  Worse, the MFT Record may be reused for another file.  If this
happens it is impossible to tell where the file was on disk.
.PP
Even if all the clusters of a file are not in use, there is no guarantee that
they haven't been overwritten by some short\-lived file.
.SS Locale
In NTFS all the filenames are stored as Unicode.  They will be converted into
the current locale for display by
.BR ntfsundelete .
The utility has successfully displayed some Chinese pictogram filenames and then
correctly recovered them.
.SS Extended MFT Records
In rare circumstances, a single MFT Record will not be large enough to hold the
metadata describing a file (a file would have to be in hundreds of fragments
for this to happen).  In these cases one MFT record may hold the filename, but
another will hold the information about the data.
.B ntfsundelete
will not try and piece together such records.  It will simply show unnamed files
with data.
.SS Compressed and Encrypted Files
.B ntfsundelete
cannot recover compressed or encrypted files.  When scanning for them, it will
display as being 0% recoverable.
.SS The Recovered File's Size and Date
To recover a file
.B ntfsundelete
has to read the file's metadata.  Unfortunately, this isn't always intact.
When a file is deleted, the metadata can be left in an inconsistant state. e.g.
the file size may be zero; the dates of the file may be set to the time it was
deleted, or random.
.br
To be safe
.B ntfsundelete
will pick the largest file size it finds and write that to disk.  It will also
try and set the file's date to the last modified date.  This date may be the
correct last modified date, or something unexpected.
.SH OPTIONS
Below is a summary of all the options that
.B ntfsundelete
accepts.  All options have two equivalent names.  The short name is preceded by
.BR \-
and the long name is preceded by
.BR \-\- .
Any single letter options, that don't take an argument, can be combined into a
single command, e.g.
.BR \-fv
is equivalent to
.BR "\-f \-v" .
Long named options can be abbreviated to any unique prefix of their name.
.TP
.BI "\-b " num
.br
.ns
.TP
.BI "\-\-byte " num
If any clusters of the file cannot be recovered, the missing parts will be
filled with this byte.  The default is zeros.
.TP
.B \-C
.br
.ns
.TP
.B \-\-case
When scanning an NTFS volume, any filename matching (using the
.B \-\-match
option) is case\-insensitive.  This option makes the maching case\-sensitive.
.TP
.BI "\-c " range
.br
.ns
.TP
.BI "\-\-copy " range
This wizard's option will write a block of MFT FILE records to a file.  The
default file is
.I mft
which will be created in the current directory.  This option can be combined
with the
.B \-\-output
and
.B \-\-destination
options.
.TP
.BI "\-d " dir
.br
.ns
.TP
.BI "\-\-destination " dir
This option controls where to put the output file of the
.B \-\-undelete
and
.B \-\-copy
options.
.TP
.B \-f
.br
.ns
.TP
.B \-\-force
This will override some sensible defaults, such as not overwriting an existing
file.  Use this option with caution.
.TP
.B \-h
.br
.ns
.TP
.B \-\-help
Show a list of options with a brief description of each one.
.TP
.B \-i
.br
.ns
.TP
.B \-\-interactive
Switches the interactive mode, meaning that for  each undeleting of a file
the user will be asked.
.TP
.BI "\-m " pattern
.br
.ns
.TP
.BI "\-\-match " pattern
Filter the output by only looking for matching filenames.  The pattern can include the
wildcards '?', match exactly one character or '*', match zero or more
characters.  By default the matching is case\-insensitive.  To make the search
case sensitive, use the
.B \-\-case
option.
.TP
.BI "\-o " file
.br
.ns
.TP
.BI "\-\-output " file
Use this option to set name of output file that
.B \-\-undelete
or
.B \-\-copy
will create.
.TP
.BI "\-p " num
.br
.ns
.TP
.BI "\-\-percentage " num
Filter the output of the
.B \-\-scan
option, by only matching files with a certain amount of recoverable content.
.B Please read the caveats section for more details.
.TP
.BI \-q
.br
.ns
.TP
.BI \-\-quiet
Reduce the amount of output to a minimum.  Naturally, it doesn't make sense to
combine this option with
.BR \-\-scan .
.TP
.B \-s
.br
.ns
.TP
.B \-\-scan
Search through an NTFS volume and print a list of files that could be recovered.
This is the default action of
.BR ntfsundelete .
This list can be filtered by filename, size, percentage recoverable or last
modification time, using the
.BR \-\-match ,
.BR \-\-size ,
.B \-\-percent
and
.B \-\-time
options, respectively.
.sp
The output of scan will be:
.sp
.nf
Inode  Flags  %age     Date      Size  Filename
 6038  FN..    93%  2002-07-17  26629  thesis.doc
.fi
.TS
lB lB
l l.
Flag	Description
F/D	File/Directory
N/R	(Non-)Resident data stream
C/E	Compressed/Encrypted data stream
!	Missing attributes
.TE
.RS
.sp
.br
The percentage field shows how much of the file can potentially be recovered.
.sp
.br
.RE
.BI "\-S " range
.br
.ns
.TP
.BI "\-\-size " range
Filter the output of the
.B \-\-scan
option, by looking for a particular range of file sizes.  The range may be
specified as two numbers separated by a '\-'.  The sizes may be abbreviated
using the suffixes k, m, g, t, for kilobytes, megabytes, gigabytes and terabytes
respectively.
.TP
.BI "\-t " since
.br
.ns
.TP
.BI "\-\-time " since
Filter the output of the
.B \-\-scan
option.  Only match files that have been altered since this time.  The time must
be given as number using a suffix of d, w, m, y for days, weeks, months or years
ago.
.TP
.BI \-T
.br
.ns
.TP
.BI \-\-truncate
If
.BR ntfsundelete
is confident about the size of a deleted file, then it will restore the file to
exactly that size.  The default behaviour is to round up the size to the nearest
cluster (which will be a multiple of 512 bytes).
.TP
.BI "\-u " [nums]
.br
.ns
.TP
.BI "\-\-undelete " [nums]
where <nums> is optional. Recover the files either by matching the
regular expression of option -m or by the given nums, which are the
inode numbers. You can specify more than one inode by separating with
"," or a range of inodes by using "-". This option can be combined with
.BR \-\-output ,
.BR \-\-destination ,
and
.BR \-\-byte .
.sp
When the file is recovered it will be given its original name, unless the
.B "\-\-output"
option is used.
.TP
.B \-v
.br
.ns
.TP
.B \-\-verbose
Increase the amount of output that
.B ntfsundelete
prints.
.TP
.B \-V
.br
.ns
.TP
.B \-\-version
Show the version number, copyright and license
.BR ntfsundelete .
.SH EXAMPLES
Look for deleted files on /dev/hda1.
.RS
.sp
.B ntfsundelete /dev/hda1
.sp
.RE
Look for deleted documents on /dev/hda1.
.RS
.sp
.B ntfsundelete /dev/hda1 -s \-m '*.doc'
.sp
.RE
Look for deleted files between 5000 and 6000000 bytes, with at least 90% of the
data recoverable, on /dev/hda1.
.RS
.sp
.B ntfsundelete /dev/hda1 \-S 5k\-6m \-p 90
.sp
.RE
Look for deleted files altered in the last two days
.RS
.sp
.B ntfsundelete /dev/hda1 \-t 2d
.sp
.RE
Undelete inodes 2, 5 and 100 to 131 of device /dev/sda1
.RS
.sp
.B ntfsundelete /dev/sda1 -u 2,5,100-131
.sp
.RE
Undelete inode number 3689, call the file 'work.doc' and put it in the user's
home directory.
.RS
.sp
.B ntfsundelete /dev/hda1 \-u 3689 \-o work.doc \-d ~
.sp
.RE
Save MFT Records 3689 to 3690 to a file 'debug'
.RS
.sp
.B ntfsundelete /dev/hda1 \-c 3689\-3690 \-o debug
.RE
.SH BUGS
There are some small limitations to this program, but currently no known bugs.
If you find one, please send an email to
.nh
<linux-ntfs-dev@lists.sourceforge.net>
.hy
.SH AUTHORS
.B ntfsundelete
was written by Richard Russon (FlatCap) and Holger Ohmacht.
.SH AVAILABILITY
.B ntfsundelete
is part of the ntfsprogs package and is available from
.br
.nh
http://linux\-ntfs.sourceforge.net/downloads.html
.hy
.SH SEE ALSO
.BR ntfsinfo (8),
.BR ntfsprogs (8)