drive space incorrect

[dvdpa]

Hi

I have a strange problem, df -h reports my drive space as:
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 133G 101G 26G 80% /
/dev/sda1 494M 28M 441M 6% /boot
none 506M 0 506M 0% /dev/shm


But after going into each directory from / and running du -h I can only account for 34gb of actual usage. This also agrees with my backups to an external drive of 33-34 gb.

I rebooted and ran fcsk on startup.

server is RHEL4 plesk 8.1

Thanks

Chuck