Ouch - that hurt - I had done this entire post, got a phoine call , when i came back i had to log in and lost the whole thing!
Here goes again:
with df i get the following:
[root@GoldenFalcon etc]# df -h /home/tom/music
Filesystem Size Used Avail Use% Mounted on
/dev/hdb1 56G 1.6G 51G 4% /home/tom/music
with du i get:
[root@GoldenFalcon etc]# du -hcs /home/tom/music
This (36G used) is correct - the files and file system are all usable - just not reporting correctly in df - which is what most of the GUI disk stat tools use.