Computer Hacking Forensic Investigator (CHFI) Practice Exam

The Logical Block Address (LBA) method is employed in storage systems to simplify the way data is accessed on hard drives. LBA assigns a unique number to each sector on the drive, allowing for efficient and straightforward access to the data stored on it. This sequential numbering enables the operating system and applications to read from or write to specific locations on the disk without needing to address the physical geometry of the drive, making data management more straightforward.

The other options represent functions related to data storage and file system management but do not accurately describe the role of LBA. For instance, creating an index for hard disk files pertains more to file systems and their organization, while designating the operating system's directory and identifying partitions involve different structural and organizational aspects of how data is stored and accessed on a hard drive. Thus, the primary purpose of LBA is clearly aligned with assigning sequential numbers to disk sectors for efficient data access.