Here's how I hide my shit.

I have a single external drive filled with some pretty regular stuff like games and shit but it has a hidden Truecrypt volume on it. On that volume is all my regular and child porn and everything pertaining to all my illegal activities. I also have a seperate internet browser installed on that volume to surf safely. It has Java, Javascript and all other forms of scripting turned off as well as being under seven proxies. Everynight before bed I use a drive cleaner and encryptor called Kremlin to wipe the free space on my main drive, as sometimes I download shit directly to there. I also make sure my web caches are clear on my normal browser as sometimes you see CP on /b/ or other places and this is normally not a problem but for me it is because I could get raided if I fuck up somehow.