A sector-by-sector copy preserves what aspect of data that a simple file copy might not?

• A. Only the most recently edited files
• B. All sectors, including unused ones, ensuring an exact byte-for-byte replica
• C. Only the file contents without metadata
• D. Only the file system structure without actual data

Answer: (B)

In digital forensics, imaging at the sector level means copying every bit on the drive, not just the files that appear in a file system. A sector-by-sector copy captures all sectors, including the ones that aren’t currently used, so you get an exact byte-for-byte replica of the entire device. This preserves data that might live in unallocated space, slack space, or hidden remnants, along with the precise layout of the file system, boot sectors, and metadata. That completeness is what a simple file copy misses, since it typically duplicates only the visible file contents and ignores unused areas and structural data. The full-sector approach is why the option about all sectors, including unused ones, is the best choice.