df reporting incorrect available space

[Chris Purves <chris@northfolk.ca>]

Hello,

I am having problems with the reported available disk space on my root 
partition with df.  The Used and Available amounts do not add up to the 
total amount.

Filesystem           1K-blocks      Used Available Use% Mounted on
/dev/hda1               255912    243314         0 100% /
tmpfs                   778404         0    778404   0% /lib/init/rw
udev                     10240        72     10168   1% /dev
tmpfs                   778404         0    778404   0% /dev/shm
/dev/hda9            105503360  27786192  72357888  28% /home
/dev/hda8               369000      8255    341085   3% /tmp
/dev/hda5              4807056   1201816   3361056  27% /usr
/dev/hda6              2885780   2297096    442096  84% /var
/dev/hdd1            480719056 233711036 222588820  52% /backup
/dev/hdb1            488252928 180889124 307363804  38% /video



--
Chris Purves

"Canada is the linchpin of the English-speaking world." - Sir Winston 
Churchill