Problem data storage in Hard Drive

Hi
It seems there are no spaces when I am running in my firewall. When I am using the df. Command, it informs me that I have used 96% of my Hard Drive and it’s all set to crash. If it collapses I have no Internet. I remove all squid activity files which are in the var/www/html/squid/weekly directory. These files amass weekly Internet activity. By using the "rm -Rf 2009Nov08-2009Nov14" command, I removed them and I don’t have any storage space. I'm not confident if they are being removed totally or not. I don’t know anything about this problem.
Need your help. Thanks.
