Any Tool to erase Hdd?

[TheMysterio]

Hi Guys

I am going to sell my 320GB External Hard disk. I have formatted it but i know the data could be recoverd from it using some file recovery program. Is there a way to erase the HDD completely? are there any free tools avaialbe for this purpose?

thx in advance

Cheers

[freezer121]

There's a free version of Killdisk at http://www.killdisk.com/downloadfree.htm.