Neil9011

I am using free version CCleaner v 5.3 .2 and my hard drive is a NTFS 500 GB ( ST500LT012-1DG142 ).My laptop has Windows 8.1 Single language with Bing which was already installed when bought new.I use Google Chrome v59 ( 64 bit ).My question or problem is that I have tried 3 times to do a Driver Wipe on my HD,but it only wipes 39% of the drive and I even left the driver wipe on during the night, but still only 39%.Why is this ?