ewfacquirestream - acquires data in the EWF format from stdin

ewfacquirestream() LOCAL ewfacquirestream()


ewfacquirestream — acquires data in the EWF format from stdin


ewfacquirestream [−A codepage] [−b number_of_sectors] [−B number_of_bytes] [−c compression_values] [−C case_number] [−d digest_type] [−D description] [−e examiner_name] [−E evidence_number] [−f format] [−j jobs] [−l log_filename] [−m media_type] [−M media_flags] [−N notes] [−o offset] [−p process_buffer_size] [−P bytes_per_sector] [−S segment_file_size] [−t target] [−2 secondary_target] [−hqsvVx]


ewfacquirestream is a utility to acquire media data from stdin and store it in EWF format (Expert Witness Format). ewfacquirestream acquires media data in a format equivalent to EnCase and FTK imager, including meta data. Under Linux, FreeBSD, NetBSD, OpenBSD, MacOS−X/Darwin

ewfacquirestream is part of the libewf package. libewf is a library to access the Expert Witness Compression Format (EWF).

The options are as follows:

−A codepage

the codepage of header section, options: ascii (default), windows-874, windows-932, windows-936, windows-949, windows-950, windows-1250, windows-1251, windows-1252, windows-1253, windows-1254, windows-1255, windows-1256, windows-1257 or windows-1258

−b number_of_sectors

the number of sectors to read at once (per chunk), options: 16, 32, 64 (default), 128, 256, 512, 1024, 2048, 4096, 8192, 16384 or 32768

−B number_of_bytes

the number of bytes to acquire

−c compression_values

specify the compression values as: level or method:level compression method options: deflate (default) compression level options: none (default), empty-block, fast or best

−C case_number

the case number (default is case_number)

−d digest_type

calculate additional digest (hash) types besides md5, options: sha1, sha256

−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: ftk, encase2, encase3, encase4, encase5, encase6 (default), encase7, encase7-v2, linen5, linen6, linen7, ewfx.


shows this help

−j jobs

the number of concurrent processing jobs (threads), where a number of 0 represents single-threaded mode (default is 4 if multi-threaded mode is supported). libewf does not support streamed writes for other EWF formats.

−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 number of bytes per sector (default is 512)


quiet shows minimal status information


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 and later formats and 1.9 GiB for other formats)

−t target

the target file (without extension) to write to (default is image)


verbose output to stderr


print version


use the data chunk functions instead of the buffered read and write functions.

−2 secondary_target

the secondary target file (without extension) to write to

ewfacquirestream will read from stding until it encounters a read error. On read error it will stop no error information is stored in the EWF file(s).

Empty block compression detects blocks of sectors with entirely the same byte data and compresses them using the default compression level.






# ewfacquirestream −C 1 −D Floppy −E 1.1 −e ’John D.’ −N ’Just a floppy in my system’ −m removable −M logical −t floppy </dev/fd0
ewfacquirestream 20120805

Using the following acquiry parameters:

Image path and filename:


Case number:




Evidence number:


Examiner name:

John D.


Just a floppy in my system

Media type:


Volume type:


EWF file format:

EnCase 5

Compression method:


Compression level:


Acquiry start offset:


Number of bytes to acquire:

0 (until end of input)

Evidence segment file size:

1.4 GiB (1572864000 bytes)

Block size:

64 sectors

Error granularity:

64 sectors

Retries on read error:


Acquiry started at: Sun Aug 5 11:32:41 2012

This could take a while.

Status: acquired 1.4 MiB (1474560 bytes)
in 1 second(s) with 1 MiB/s (1474560 bytes/second).

Acquiry completed at: Sun Aug 5 11:32:42 2012

Written: 1.4 MiB (1474560 bytes) in 1 second(s) with 1 MiB/s (1474560 bytes/second).

MD5 hash calculated over data:



Errors, verbose and debug output are printed to stderr when verbose output −v is enabled. Verbose and debug output are only printed when enabled at compilation.


Please report bugs of any kind to <[email protected]> or on the project website: https://github.com/libyal/libewf/


These man pages were written by Joachim Metz.


Copyright (C) 2006-2023, Joachim Metz <[email protected]>.

This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.


ewfacquire(1), ewfexport(1), ewfinfo(1), ewfmount(1), ewfrecover(1), ewfverify(1) libewf August 7, 2022 ewfacquirestream()

Updated 2024-01-29 - jenkler.se | uex.se