du

having 2 issues: 1. just install a new hd 160GB but du only shows aprox. 150GB anything i can do to display full size of drive using 9.3 lares:/home/boricua # df -h Filesystem Size Used Avail Use% Mounted on /dev/hda4 129G 2.1G 127G 2% / tmpfs 126M 0 126M 0% /dev/shm /dev/hda2 9.9G 38M 9.4G 1% /home /dev/hda3 11G 103M 10G 2% /var 2. the old drive i set as slave but is not seen by the system i would like to mount it to retried some data from it thanks