One of them provided the iPhone as an example, and that it is now impossible to get a full forensic image of an iPhone. (lawtechnologytoday.org)
This move meant I was less involved in casework, so I had time to write my doctoral thesis, «Content - Based Information Retrieval from Forensic Image Databases,» and I successfully defended it in June 2002. (sciencemag.org)
The hashes exist to confirm that the working copy is the same as the original forensic image. (law.stackexchange.com)