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corpora/scenarios/2012-ngdc/extra/ sub-dirs:

Name	Size	Last Modified	SHA2-256	SHA3-256
README.txt	139	2020-11-22 10:06:45Z	9d37114b85b7199d9b20078c81302f1e676ac960e2d8386e39445c4ab38efa96	b7f29220e66e35399143cddd994884bdd2ce601741e6ce8a5f945c1a2677c8a3

These directories are additional ("extra") disk images that were made with alternative 
tools. You can use them for inter-tool validation.