Thus spake Julian Elischer <julian@elischer.org>:
> > contents of the sector are there.  I think we would need to
> > implement journalling to ensure integrity if hard drives were
> > likely to corrupt sectors on power failure.  (How often do they do
> > this right now, and how often would they with 4K sectors?)
> 
> 
> in this case teh journel would have to not only include the block being
> written, but data on each side of it that may be in teh same 4k.
> that implies a read..

If you had to do that, then nearly every write would be a
read-modify-write cycle.  It would be far less painful
to use 4K blocks or larger and align filesystem blocks
to disk sectors.