defragmentation in FreeBSD 4.11

[Victor Semionov]

> This is one of the things I find really hard to get Windows users to
> understand.  They just won't believe that a company like Microsoft would
> still be using a filesystem that needs defragmenting if it were possible
> to design one that didn't.  I often wonder why myself - after all, they
> must have put a fair amount of work into NTFS, which at least doesn't
> seem to get corrupted in a power failure.  Did they make a trade-off I
> don't understand, or is it just incompetence - or worse, a deal with
> disk manufacturers to sell more disk?

Why is it unnecessary to defragment UFS?