What is disk imaging, and what standards govern it?

• A. Imaging only memory
• B. Copying only user data
• C. Creating a bit-for-bit copy of a storage device; standards include ISO/IEC 27037 guidance and practices like write blockers and checksum verification
• D. Only for live systems

Answer: (C)

Disk imaging is the process of creating a bit-for-bit copy of a storage device, capturing every sector so the copy is an exact replica of the original, including deleted data, file system structures, and hidden areas. This exact copy lets investigators analyze the data without altering the original evidence, which is crucial for preserving integrity.

Standards and best practices guiding this work include ISO/IEC 27037, which provides guidance on identifying, collecting, acquiring, and preserving digital evidence. Practical safeguards include using write blockers to ensure the source drive isn’t modified during imaging, and generating and verifying checksums (hashes) for both the original and the copy to prove they are identical. Disk imaging covers the entire storage medium, not just memory or user data, and it applies to both live and powered-down systems when proper precautions are followed.