ewfacquire LOCAL ewfacquireNAMEewfacquire — acquires data in the EWF format
SYNOPSISewfacquire [-A codepage] [-b amount_of_sectors] [-B amount_of_bytes]
[-c compression_type] [-C case_number] [-d digest_type]
[-D description] [-e examiner_name] [-E evidence_number]
[-f format] [-g amount_of_sectors] [-l log_filename]
[-m media_type] [-M media_flags] [-N notes] [-o offset]
[-p process_buffer_size] [-P bytes_per_sector]
[-r read_error_retries] [-S segment_file_size] [-t target]
[-2 secondary_target] [-hqRsuvVw] source
DESCRIPTIONewfacquire is a utility to acquire media data from a source and store it
in EWF format (Expert Witness Compression Format). ewfacquire acquires
media data in a format equivalent to EnCase and FTK imager, including
meta data. Under Linux, FreeBSD, NetBSD, OpenBSD, MacOS-X/Darwin
ewfacquire supports reading directly from device files. On other plat‐
forms ewfacquire can convert a raw (dd) image into the EWF format.
ewfacquire is part of the libewf package. libewf is a library to support
the Expert Witness Compression Format (EWF). libewf supports both the
SMART format (EWF-S01) and the EnCase format (EWF-E01). libewf currently
does not support the Logical Volume format (EWF-L01). EWF-X is an expiri‐
mental format intended for testing purposes to enhance the EWF format.
libewf allows you to read and write media data in the EWF format.
source the source file or device
The options are as follows:
-A codepage
the codepage of header section, options: ascii (default), win‐
dows-874, windows-1250, windows-1251, windows-1252, windows-1253,
windows-1254, windows-1255, windows-1256, windows-1257, win‐
dows-1258
-b amount_of_sectors
the amount of sectors to read at once (per chunk), options: 64
(default), 128, 256, 512, 1024, 2048, 4096, 8192, 16384 or 32768
-B amount_of_bytes
the amount of bytes to acquire
-c compression_type
the compression type, options: none (default), empty-block, fast,
best
-C case_number
the case number (default is case_number)
-d digest_type
calculate additional digest (hash) types besides md5, options:
sha1
-D description
the description (default is description)
-e examiner_name
the examiner name (default is examiner_name)
-E evidence_number
the evidence number (default is evidence_number)
-f format
the EWF file format to write to, options: ewf, smart, ftk,
encase1, encase2, encase3, encase4, encase5, encase6 (default),
linen5, linen6, ewfx.
-g amount_of_sectors
the amount of sectors to be used as error granularity, options:
64 (default), 128, 256, 512, 1024, 2048, 4096, 8192, 16384 or
32768
-h shows this help
-l log_filename
logs acquiry errors and the digest (hash) to the log filename
-m media_type
the media type, options: fixed (default), removable, optical,
memory
-M media_flags
the media flags, options: logical, physical (default)
-N notes
the notes (default is notes)
-o offset
the offset to start to acquire (default is 0)
-p process_buffer_size
the process buffer size (default is the chunk size)
-P bytes_per_sector
the amount of bytes per sector (default is 512) (use this to
override the automatic bytes per sector detection)
-q quiet shows no status information
-r read_error_retries
the amount of retries when a read error occurs (default is 2)
-R resume acquiry at a safe point
-s swap byte pairs of the media data (from AB to BA) (use this for
big to little endian conversion and vice versa)
-S segment_file_size
the segment file size in bytes (default is 1.4 GiB) (minimum is
1.0 MiB, maximum is 7.9 EiB for encase6 format and 1.9 GiB for
other formats)
-t target
the target file (without extension) to write to (default is
image)
-u unattended mode (disables user interaction)
-v verbose output to stderr
-V print version
-w wipe sectors on read error (mimic EnCase like behavior)
-2 secondary_target
the secondary target file (without extension) to write to
ewfacquire will read from a file or device until it encounters a read
error. On read error it will retry the amount of retries specified. If
ewfacquire still is unable to read and, if specified, it will zero (wipe)
the the remainder of the amount of sectors specified as error granular‐
ity. If ewfacquire should mimic EnCase it will wipe all of sectors speci‐
fied as error granularity.
Empty block compression detects blocks of sectors with entirely the same
byte data and compresses them using the default compression level.
The encase6 format allows for segment files greater than 2 GiB
(2147483648 bytes).
ENVIRONMENT
None
FILES
None
EXAMPLESewfacquire will ask for the information it requires.
# ewfacquire /dev/fd0
ewfacquire 20090503 (libewf 20090503, libuna 20090124, zlib 1.2.3, libcrypto 0.9.8g, libuuid)
Information about acquiry required, please provide the necessary input
Image path and filename without extension: floppy
Case number: 1
Description: Floppy
Evidence number: 1.1
Examiner name: John D.
Notes: Just a floppy in my system
Media type (fixed, removable, optical, memory) [fixed]: removable
Media characteristics (logical, physical) [logical]:
Use compression (none, empty-block, fast, best) [none]:
Use EWF file format (smart, ftk, encase1, encase2, encase3, encase4, encase5, encase6, linen5, linen6, ewfx) [encase6]:
Start to acquire at offset (0 >= value >= 1474560) [0]:
The amount of bytes to acquire (0 >= value >= 1474560) [1474560]:
Evidence segment file size in bytes (1.0 MiB >= value >= 1.9 GiB) [1.4 GiB]:
The amount of bytes per sector (0 >= value >= 4294967295) [512]:
The amount of sectors to read at once (64, 128, 256, 512, 1024, 2048, 4096, 8192, 16384, 32768) [64]:
The amount of sectors to be used as error granularity (1 >= value >= 64) [64]:
The amount of retries when a read error occurs (0 >= value >= 255) [2]:
Wipe sectors on read error (mimic EnCase like behavior) (yes, no) [no]:
The following information was provided:
Image path and filename: floppy.E01
Case number: 1
Description: Floppy
Evidence number: 1.1
Examiner name: John D.
Notes: Just a floppy in my system
Media type: removable
Is physical: no
Compression used: none
EWF file format: Encase 5
Acquiry start offset: 0
Amount of bytes to acquire: 1.4 MiB (1474560 bytes)
Evidence segment file size: 1.4 GiB (1572864000 bytes)
Block size: 64 sectors
Error granularity: 64 sectors
Retries on read error: 2
Wipe sectors on read error: no
Continue acquiry with these values (yes, no) [yes]:
Acquiry started at: Sat Feb 28 11:32:41 2009
This could take a while.
Status: at 2%.
acquired 32 kB (32768 bytes) of total 1.4 MiB (1474560 bytes).
...
Status: at 100%.
acquired 1.4 MiB (1474560 bytes) of total 1.4 MiB (1474560 bytes).
completion in 1 second(s) with 1 MiB/s (1474560 bytes/second).
Acquiry completed at: Sat Feb 28 11:32:42 2009
Written: 1.4 MiB (1474560 bytes) in 1 second(s) with 1 MiB/s (1474560 bytes/second).
MD5 hash calculated over data: ae1ce8f5ac079d3ee93f97fe3792bda3
DIAGNOSTICS
Errors, verbose and debug output are printed to stderr when verbose out‐
put -v is enabled. Verbose and debug output are only printed when enabled
at compilation.
BUGS
Please report bugs of any kind to <forensics@hoffmannbv.nl> or on the
project website: http://libewf.sourceforge.net/
AUTHOR
These man pages were written by Kees Mastwijk.
Alterations for distribution have been made by Joachim Metz.
COPYRIGHT
Copyright 2006-2009 Kees Mastwijk, Hoffmann Investigations <foren‐
sics@hoffmannbv.nl> and contributors.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PUR‐
POSE.
SEE ALSOewfacquirestream(1), ewfexport(1), ewfinfo(1), ewfverify(1)libewf January 9, 2010 libewf
