For a simple LLF the zero-wipe is all that's needed. You end up with a clean hard disk 'down to the metal' as they say. Which always gives a better foundation to build on.
I should mention that a modern IDE has ongoing statistical information that it uses to mark a bad sector so as not to use it again.
http://en.wikipedia.org/wiki/Disk_forma ... hard_disks
various drive manufacturers describe reinitialization software as LLF utilities on their web sites.
I tend to give the manufacturer rights as to what to call it.