Add to ORKGA shortened version of this paper appeared in the Proceedings of the Ninth EAI International Conference on Digital Forensics and Computer Crime, Prague, Czech Republic, October 2017.The article of record as published may be found at http://dx.doi.org/10.15394/jdfsl.2018.1491Memory acquisition is essential to defeat anti-forensic operating-system features and investigate cyberattacks that leave little or no evidence in secondary storage. The forensic community has developed tools to acquire physical memory from Apple's Macintosh computers, but they have not much been tested. This work tested three major OS X memory-acquisition tools. Although the tools could capture system memory accurately, the open-source tool OSXPmem appeared advantageous...