chown

[Advent Systems]

Guys,
    I need to change the ownership of LOTS of files.  There are approx 
50 sub-directorys, most with sub-sub directorys which have 15-20 files 
in each.  From what I gathered from the man pages I should be using the 
-R option with chown but it starts to change the ownership then I get 
the message: "Operation not supported".  I can go into each directory 
and change the ownership with "chown <new owner> *" but this is taking 
forever and It seems there has to be a better way?

Thanks'
Bob Randal