Clean install of windows 7 but uncleared hard drive

Visitivity

Honorable
Jan 4, 2013
1
0
10,510
Recently did a clean install of windows 7 on my laptop but when I finished the install, I noticed that there still 158 gb used space on my hardddrive. Is this normal? I thought I had reformatted the entire system as i don't have aceess to any of my pre-existing files...