>>>>> "Malcolm" == Malcolm Herbert <mjch@mjch.net> writes:

    Malcolm> [...]

    Malcolm> Is there a tool which will inspect what's on disk and
    Malcolm> give you a summary of what it found? I'm specifically
    Malcolm> looking for things like block size, bytes per inode,
    Malcolm> inodes per group, root reserved allocation, that sort of
    Malcolm> thing ...

What about

  [man] dumpfs

Markus.