Which AFF4 object stores segments that are indivisible blocks of data?

The correct choice is volumes, which are fundamental components of the Advanced Forensic Format (AFF). In AFF4, volumes function as a container for segments of data, and each volume represents a specific logical or physical storage medium. They can hold indivisible blocks of data, which ensures that each segment is treated as a distinct unit for further operations or analysis.

Understanding volumes is crucial in digital forensics, as they facilitate the organization and management of data within the forensic process. When working with digital artifacts, volume integrity is vital for maintaining the evidence's authenticity and reliability. By isolating segments of data within a volume, forensic investigators can easily access, analyze, and preserve these individual units without risking alterations to the original data.

In contrast, while graphs, images, and files do have roles within the AFF format, they do not specifically represent indivisible blocks of data in the same way that volumes do. Graphs may illustrate relationships or structures within data, images can represent visual content, and files generally refer to collections of data. However, volumes are integral components that specifically encapsulate segments of data in a structured and logical manner within the digital forensic framework.