Um... Nero is a program for burning CDs and DVDs on optical drives.  It is usually shipped with optical drives, not hard drives.  For more info on Nero go to  http://www.nero.com/enu/index.html  .  That's it's homepage.  Nero in no way impacts the hard drives.  The applet that Nero installs and runs on bootup is a detector which just detects when a recordable optical disk is put in the drive.