Clearing data from (Data recovery software freeware) hard drive

Clearing data from (Data recovery software freeware) hard drive 

Clearing data from hard drive 
Question:I am planning to sell my laptop (Toshiba Satellite 2800 series, about five years old) and want to know how I go about wiping out my hard drive of any personal information. I've been told that just reloading the operating software (Windows XP) will do this, but I want to know for sure.
Source: www.philly.com

Symbian in Q2 
Symbian has released Q2 2006 sales figures, showing the usual robust growth. Highlights include 23 new Symbian OS-powered models introduced in Q2, ownership of 92% of the worldwide 3G market, 12 million smartphones shipped in Q2, bringing cumulative total to 83 million worldwide.
Source: www.allaboutsymbian.com

Wiping out hard drive needs some software 
Q. I am planning to sell my laptop (Toshiba Satellite 2800 series, about five years old) and want to know how I go about wiping out my hard drive of any personal information.
Source: www.ocregister.com