The sblock dialog interprets an sblock and it's various fields.

sblock.png

At the top of this dialog is the "File Range Control". The file range control gives you a quick graphical view of where in the file this block is located.

Next comes the sblock header. This is always located as the start of an sblock.
The block trailer dialog includes an interpretation of the fields of the block trailer structure. They include:
Below the block trailer is the contents of the sblock (logically; the "subnodes" of the node referencing this sblock) are shown as a tree view. Double clicking on these blocks will open browse to that location in the BBT. If this block is a level 1 sblock, data from the level 0 sblocks will automatically be read in order to fill out the tree.