When examining a file with a hex editor, which part of the file contains the header?

• A. The first several bytes of the file
• B. The last several bytes of the file
• C. One byte at the beginning of the file
• D. None, file headers are contained in the FAT

Answer: (A)

In hex editing, the header is found at the very start of the file—the first several bytes. These initial bytes often contain a file signature or magic number that identifies the format and tells software how to interpret the rest of the data. For example, PNG files begin with a specific eight-byte sequence, PDFs start with “%PDF-”, and JPEGs begin with a particular two-byte marker followed by others. This header establishes the file’s structure and type, which is why you see it immediately when you open the file.

The idea that the header is at the end is incorrect, and it’s not limited to a single byte. The FAT belongs to the filesystem and stores metadata about where the file’s blocks live on disk, not the internal header of the file itself.