This morning I read an article by Denise Dubie promoting corporate data protection when it comes to recycling or disposing of old computers. 

Getting rid of obsolete IT gear isn’t as simple as it used to be. The threat of data loss, coupled with increasingly stringent environmental regulations, has IT pros rethinking their disposal methods.

When people ask me for my preferred tool for drive wiping, I still point them over to Darik's Boot & Nuke "DBAN", which is a great utility for wiping drives.  They have bootable versions available for floppy, USB thumb drives, and the popular CD/DVD iso formats.

-Chris