ref: 2473bd0e87137da5a04c269beb06c2162839390d dir: /tests/test.d/notes/
Creates a disk of 38 (Nmbinblocks+5*Metadataunits) blocks. Unmarked blocks are filled from /dev/random. Duplicate of test.2 but seeded with random data. test mkdir -p a/b/c/d/e