hello, a have strange problem

--\/--
pulstar# /usr/bin/du -sk /home
3168104 /home
pulstar# /bin/df -k /home
Filesystem  1K-blocks     Used     Avail Capacity  Mounted on
/dev/wd0e     5071221  3870832    946827    80%    /home
pulstar# 
--/\--

 du says that in use is 3168104 k
 df says that in use is 3870832 k

 difference is about 700 MB, anybody know why?

uanme -a
NetBSD pulstar 1.5Y NetBSD 1.5Y (ALBEDO) #0: Tue Oct 23 10:18:20 CEST
2001     root@pulstar:/xds/sup/src/sys/arch/i386/compile/ALBEDO i386

userspace compiled at Nov 7 2001



-- 
  Adam Majewski <am@albedo.art.pl>