henry0 - 10:32 am on May 8, 2009 (gmt 0)

popularmechanic recommends drilling four holes all the way through. Or if you may open up the hdd and sand down the disks.

Untested: What's about baking'em one hour at 500?

Personally, I do not own a sledge hammer, nevertheless I always use a regular heavy hammer, it does the job very well.

Here in CT there is a corp that comes to your biz place and claims to 100% rem your data from old hdd.