Update cheatsheets

dcfldd

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# dcfldd
+
+> Enhanced version of dd for forensics and security.
+> More information: <http://dcfldd.sourceforge.net/>.
+
+- 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 1 GB chunk:
+
+`dcfldd if=/dev/{{disk_device}} of={{file.img}} hash={{sha512|sha384|sha256|sha1|md5}} hashlog={{file.hash}} hashwindow={{1G}}`