# dcfldd > Enhanced version of dd for forensics and security. > More information: . - Copy a disk to a raw image file and hash the image using SHA256: `dcfldd if=/dev/{{disk_device}} of={{file.img}} hash=sha256 hashlog={{file.hash}}` - Copy a disk to a raw image file, hashing each 1GB chunk: `dcfldd if=/dev/{{disk_device}} of={{file.img}} hash={{hash_algorithm}} hashlog={{file.hash}} hashwindow={{1G}}`