• A bit-by-bit duplicate of a backup tape or hard drive that is forensically sound. Also known as an image copy, a forensic copy or a mirror image.  1  2
  • As distinct from document imaging, electronic evidence is making an identical copy of a hard drive. Also known as a “mirror image” or “mirroring”.  3
  • An electronic “picture” of how the document would look if printed. Images can be stored in various file formats, the most common of which are TIFF and PDF.


  1. RenewData, Glossary (10/5/2005).
  2. Vinson & Elkins LLP Practice Support, EDD Glossary.
  3. Legal Electronic Document Institute, Basic Principles of Automated Litigation Support (2005).
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