The graphic depicts a data file as a vertical rectangle. The topmost slab is labeled "Data File Header." Below is a slab of 12 blocks. The whole slab is labeled "Initial Extent of Segment." The first block is labeled "First Block of Segment (contains directory of extents)." The 3rd block from the left is labeled "Data Block (logically contiguous with other blocks in the extent)." The rest of the data file is blank and is labeled "Free (Formatted, Never Used)."