Difference between pages "Encase image file format" and "Data copy king"

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The Encase image file format is used by [[EnCase]] used to store various types of digital evidence e.g.
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Data Copy King is one disk image hardware,DoD data wipe hardware and also used as one professional forensic disk image tool.
* disk image (physical bitstream of an acquired disk)
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* volume image
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* memory
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* logical files
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Data Copy King has build-in IDE and SATA ports and supports USB data copy with adapters, it is one 1:1 hard drive duplicator. The top features of DCK is its claimed disk image speed at 7GB/min and data wipe speed at 8GB/min and its ability to copy bad sectors/unstable drives.
  
The format is (reportedly) based on ASR Data's Expert Witness Compression Format [http://www.asrdata.com/SMART/whitepaper.html].
 
Currently there are 2 version of the format; version 1 is a closed format and was succeeded by version 2 in EnCase 7, for which a format specification is available, but requires registration.
 
  
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[[Image:Hard_drive_duplicator_data_copy_king.jpg|frame|Data Copy King package]]
  
The media data can be stored in multiple evidence files, which are called segment files.
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== Universal hard drive duplicator ==
Each segment file consist of multiple sections, which has a distinct section start definition containing a section type.
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Up to EnCase 5 the segment file were limited to 2 GiB, due to the internal 31-bit file offset representation. This limitation was lifted by adding a base offset value in EnCase 6.
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1, 'Universal' indicates the storage medias from hard drives to flash drives, from good storage medias to storage medias with defects such as a lot of bad sectors, unstable heads or motor after head or platter swap, clicking drives but still detected in the bios or other kind of logical failure with detected status;
  
EnCase allows to store the data compressed either using a fast or best level of the deflate compression method.
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2, 'Universal' suggests a combination of multiple Data Copy related solutions such as drive health checking, data clean or data destruction;
EnCase 7 no longer distinguishes between fast or best compression and just provides for either uncompressed or compressed.
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3, 'Universal' means the wide use among different fields like data recovery field, IT after sale field, Education and training field, Government and miliary field, computer forensics field, Financial department field etc;
  
Besides digital evidence the evidence files, or segment files, contain a header containing case information.
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4, One important thing to mention about the 'Universal' here is the green concept used, no backdoor design, physical read only, 0 training required, friendly and nice interface, Energy-saving, cost effective, etc.
The case information which entails date and time of acquisition, an examiner's name, notes on the acquisition, and an optional password.
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* In EnCase 3 the case information header is stored in the "header" section, which is defined twice within the file and contain the same information.
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* As of EnCase 4 an additional "header2" section was added. The "header" section now appears only once, but the new "header2" section twice.
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The format adds error detection by storing the data with checksums (Adler32), for both the metadata as the data blocks, which are by default 64 x 512 byte sectors (32 KiB).
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As of EnCase 5 the number of sectors per block (chunk) can vary.
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EnCase 3F introduced an "error2" section that it uses to record the location and number of bad sector chunks. The way it handles the sections it can't read is that those areas are filled with zero.
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Then EnCase displays to the user the areas that could not be read when the image was acquired. The granularity of unreadable chunks appears to be 32K.
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As of EnCase 5 the granularity of unreadable chunks can vary.
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EnCase 3 can store a one-way hash of the data. For a bitstream it does so by calculating e.g. a MD5 hash of the original media data and adds a hash section to the last of the segment file.
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As of EnCase 6 the option to store a SHA1 hash was added.
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EnCase 5 and later have the option to store '''single files''' into the EnCase Logical Evidence File (LEF) or EWF-L01.
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This format changed slightly in EnCase 6 and 7.
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In EnCase 7 the EWF format was succeeded by the EnCase Evidence File Format Version 2 (EWF2-EX01 and EWF2-LX01).
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EWF2-EX01 is at it's lower levels a different format then EWF-E01 and provides support for:
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* bzip2 compression
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* direct encryption (AES-256) of the section data
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The same features are added to the new logical evidence file format (EWF2-LX01) with the exception of encryption.
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EWF2-EX01, EWF2-LX01 are not backwards compatible with previous EnCase products.
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== See Also ==
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* [[EnCase]]
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* [[File:ASR Data's Expert Witness Compression Format.pdf]]
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== External Links ==
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* [http://www.guidancesoftware.com/DocumentRegistration.aspx?did=1000018246 EnCase Evidence File Format Version 2], requires registration
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* [http://code.google.com/p/libewf/downloads/detail?name=Expert%20Witness%20Compression%20Format%20%28EWF%29.pdf Expert Witness Compression Format (EWF)].
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* [http://code.google.com/p/libewf/downloads/detail?name=Expert%20Witness%20Compression%20Format%202%20%28EWF2%29.pdf Expert Witness Compression Format (EWF) version 2].
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* [http://www.cfreds.nist.gov/v2/Basic_Mac_Image.html Sample image in EnCase, iLook, and dd format] - From the [[Computer Forensic Reference Data Sets]] Project
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[[Category:Forensics File Formats]]
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Revision as of 22:52, 6 April 2010

Data Copy King is one disk image hardware,DoD data wipe hardware and also used as one professional forensic disk image tool.

Data Copy King has build-in IDE and SATA ports and supports USB data copy with adapters, it is one 1:1 hard drive duplicator. The top features of DCK is its claimed disk image speed at 7GB/min and data wipe speed at 8GB/min and its ability to copy bad sectors/unstable drives.


Data Copy King package

Universal hard drive duplicator

1, 'Universal' indicates the storage medias from hard drives to flash drives, from good storage medias to storage medias with defects such as a lot of bad sectors, unstable heads or motor after head or platter swap, clicking drives but still detected in the bios or other kind of logical failure with detected status;

2, 'Universal' suggests a combination of multiple Data Copy related solutions such as drive health checking, data clean or data destruction;

3, 'Universal' means the wide use among different fields like data recovery field, IT after sale field, Education and training field, Government and miliary field, computer forensics field, Financial department field etc;

4, One important thing to mention about the 'Universal' here is the green concept used, no backdoor design, physical read only, 0 training required, friendly and nice interface, Energy-saving, cost effective, etc.