Computer Hacking Forensic Investigator (CHFI) Practice Exam 2025 - Free CHFI Practice Questions and Comprehensive Study Guide

The correct choice highlights a crucial aspect of disk imaging tools in forensic investigations. A reliable disk imaging tool must compute a hash value for the complete bit stream copy, as this process plays a vital role in ensuring the integrity and authenticity of the data being analyzed.

When performing disk imaging, the hash value serves as a unique fingerprint of the data at the time of capture. By calculating and recording this hash value, forensic investigators can later verify that the imaged data remains unchanged, which is essential for maintaining the chain of custody in legal situations. If a tool does not compute a hash value, there would be no way to confirm that the data has not been altered during the imaging process, undermining the validity of the forensic analysis.

In contrast, the other requirements for disk imaging tools—such as not changing the original content, logging input/output errors, and being capable of withstanding scientific and peer review—are fundamental principles in forensic practices aimed at preserving data integrity and ensuring the reliability of the imaging process. These components contribute to the overall trustworthiness and evidentiary value of the digital evidence collected.