memory troubles?

[Ashley Benton]

Hi
I reinstalled windows on my computer for my son and now I am reinstalling
Ubuntu 7.10 but I seem to have a memory trouble.
It is what I read when I use top
tasks 106 total, 3 running, 103 sleeping, 0 stopped, 0 zombie
CPU (s) 0.3%us, 0.3%sy, 0.0% ni, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st
Mem:  515712k total,  476224k used, 39488k free 29392k buffers
Swap:  1510068k total, 20540k used, 1489528 free, 195212 cached

When I open the disk usage analyser it writes total flisystem capacity
353.9GB (Used 5.1 GB, available 348.8 GB)
/ 100% 4.9GB 19 items
  usr 69.8% 3.4GB 10 items

>From what I understand my / is full and usr almost full but where are the
348.8 GB that are still free?
Internet is unplug so I am sure that has nothing to do with it and I have no
idea what that mean or what I did wrong.
Any help would be welcome
Thank you
Meg
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