Use of Norton Power Eraser in NIS 2012.

Hi.

 

I would like to know why I would need the Power Eraser, if NIS is actively protecting my system?

 

http://security.symantec.com/nbrt/overview.aspx?pname=NIS&pversion=19.1&layout=esd&env=prod&ssdcat=221&lcid=1033&serviceid=2&origin=stmnu&tooltype=nbrt&osver=5.1

 

Thanks.

 

Atomic Blast :)