I've been using DBAN: http://www.dban.org
Just did something similar last week. Had about 12 to 15 old hard drives taken from various work computers and laptops of the last 20 years. Spent about 10 minutes with a big ball peen hammer beating the platters to death. Except for a couple of old 5 1/4" hard drives. I disassembled those and removed the platters altogether. Those big, thick old platters are pretty cool.
Last edited by spockcat; 05-06-2012 at 01:52 PM.
I use "Disk Doctor's Data Sanitizer" (the trial version). The full version unlocks more advanced wiping algorithms. It works and is easy to use so I haven't looked elsewhere.