Last night was the first night I started using Eraser. I'm using Windows 7 64-bit. Since the process is rather slow to clean 300Gb hard drive, I let it run over night. I had 300Gb free space out of 450Gb partition. Well today, I find that I only have 12Gb free. It seems like Eraser populated the memory rather than just scrubbing it. How do I fix this? What happened?