Shred your unused space on your hard drive

My computer is getting up there in age- maybe 4-5 years old. I recently notices that I only had 94GB left on my 500GB hard drive. I used a data shredder from Hirens boot cd, but you can find free ones on the web, to clean the free space on my C drive. I now have 257 GB of free space. Make sure you have everything backed up and then shred the unused space on the C drive to permanently delete the deleted data on your hard drive.