Mac Pro hard drive gets full in minutes

My OS hard drive is 500GB - I normally use 200GB and I have other internal drives for all my other files, leaving it steadily at 300GB free. Every 48 hours or so, my OS hard drive goes from 300GB free to 0MB free within a very short period of time ( about 20 mins ). I've located where the space hog is and it's the cores folder on the root directory. There are hundreds of these huge encrypted files that are 500MB a piece and they're all named "core" with a number for the extension - EX: core.6794, core.6795, core.6796 ...
So what I have to do is delete everything in the cores folder, then restart my computer - if i don't restart, it will just fill up again.
I have been having this problem for a long time and have tried just about everything to get this fixed.

Thanks for the recommendations. I'm going to try to turn core dumps off manually from http://blog.e-shell.org/14.
It also says to disable core dumps creation on next reboot, edit your /etc/sysctl.conf, but I don't have a sysctl.conf file in that dir on my Mac Pro. Would the conf file be located somewheres else?

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