Do you have kids crawling around the internet and you don't have a clue of what they're doing. (I know this has nothing to do with storage but I couldn't leave this one just for myself.)
I've had that same problem and I've tried numerous things however last week I came across a very nifty service called Open DNS. The good thing is you don't have to install anything and it works right out of the box. What is basically does is checking on DNS queries and if a query from your ipadress matches a site defined in one of the categories it returns a blocked page. You can even modify this page if you want.
Now smart kids obviously know that if you change this DNS server back to your ISP's ones they can circumvent that. The way to overcome that is to restrict the rights on your PC so they can't.
Have a look at http://www.opendns.com and start having your kids be safe on the net.
Now be aware that this doesn't mean it captures all so having multiple security measures like antivirus and a firewall in place is always advisable.