What is a forensic image?

A forensic image refers to a bit-by-bit copy of a digital device, which is created to ensure that the data is preserved in its original state without alteration. This process is critical in digital forensics as it captures all the information stored on the device, including active files, deleted files, hidden files, and system files, which are essential for a thorough investigation. By creating a forensic image, investigators can work on the copied data while leaving the original device intact, maintaining the chain of custody and integrity of the evidence.

The significance of this approach lies in the legal and technical requirements of digital forensics, where any modification of the original data could compromise the evidence and lead to challenges in court. This practice allows forensic analysts to analyze the data safely and accurately, making it a cornerstone of digital forensic investigations.

In contrast, the other options describe different aspects of investigations or processes that do not fulfill the definition of a forensic image. They lack the fundamental characteristics of preserving data integrity and providing a comprehensive view of the digital evidence necessary for forensic purposes.