How do I completly remove data??

[Ollie's Gadgets]

I have some old hard drives which I am intending on selling on ebay. However I want to make sure that all of the data has been removed before posting them off to safeguard aggainst identity theft.

I know that by doing a format the data can still be accessed using specialist hard drive software. Apparently you have to write over the data many times to fully "destroy" it. How can I go about doing this? Are there any programs which you guys have used?

Any help is very much appreciated.

 

[Ollie's Gadgets]

Thanks that is exactly the sort of program I am after. Nice one

 

[Ollie's Gadgets]

WOW! 35 passes. You working for the Government