EXT4 vs. NTFS: Unraveling the Forensic Challenges in Two Popular File System

 EXT4 and NTFS are two popular file systems. EXT4 is used in Linux and NTFS is used in Windows-based systems. While EXT4 uses journaling to provide a log of changes to the file system providing data integrity and aiding in faster recovery after system crashes or power failures, it is more susceptible to fragmentation. When using NTFS, new challenges regarding encryption, compression, and alternate data streams make utilizing file systems more complex. Forensic examiners often work with both file systems to access and interpret evidence from different types of storage media and devices.

While EXT4 benefits from journaling for faster recovery and data integrity, it may require additional efforts to address fragmentation issues. On the other hand, NTFS's advanced features, like encryption and compression, add complexity to examinations, demanding specialized tools and expertise to handle encrypted or compressed data. EXT4 and NTFS are significant because they reveal that forensic examiners are not just tied to one preferred operating system but, instead, must learn to work on them all.

Autopsy is a forensic platform that includes a graphical interface for examiners to conduct investigations. Autopsy supports both EXT4 and NTFS, allowing examiners to perform analysis tasks through a visual interface instead of being reliant on using the file system offered on their operating system. Autopsy helps bridge the differences and provides a compatible alternative. More complex tasks in Autopsy that are performed in EXT4 and NTFS might require additional tools for Alternate Data Streams and encryption; however, Autopsy provides a fantastic starting place that exists across operating systems. It definitely adds to the discussion because many tasks can be performed in Autopsy instead of relying on only EXT4 or NTFS. When a forensic investigation begins in Autopsy, the forensic investigator has the option to seamlessly move over to EXT4 or NTFS whenever necessary and actually receives the best of both worlds.

References: 

Jaconski, M., & Dustin, D. (2022, September 19). Using Alternate Data Streams in the Collection and Exfiltration of Data. SEI Blog. https://insights.sei.cmu.edu/blog/using-alternate-data-streams-in-the-collection-and-exfiltration-of-data/

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