An investigator is examining a hard disk and finds a large amount of unused space...

This scenario aligns with CHFI v11 objectives underAnti-Forensics TechniquesandDisk and File System Analysis. Attackers and sophisticated users may intentionally hide data in areas of a disk that are not addressed by the operating system, such asinter-partition gaps, slack space, or unallocated space. These techniques are commonly used as anti-forensic methods to conceal illicit data from standard file system views and basic forensic tools.

CHFI v11 emphasizes that such hidden data cannot be accessed through normal OS utilities, disk cleanup tools, or backups that rely on file system structures. Instead, forensic investigators must usedisk editor toolsor low-level forensic utilities that allow direct sector-by-sector examination of the storage media. Disk editors enable investigators to view raw hexadecimal data, inspect unallocated areas, analyze partition tables, and uncover hidden or deliberately concealed content stored outside recognized partitions.

Reformatting or cleaning the disk would destroy potential evidence and violate forensic principles, while full disk backups alone do not inherently reveal hidden inter-partition data without further low-level analysis. Therefore, consistent with CHFI v11 best practices for uncovering hidden data and countering anti-forensic techniques, using disk editor tools to examine the inter-partition gap is the correct and forensically sound approach.