Some people and organisations use GNU/Linux to save money or stop wasting resources. This page is to help put people who have surplus hardware in touch with those who need it:
Deleting hard disk contents before donating hardware
Refer to US Department of Defense standard ‘DoD 5220.22-M’
http://ftp.aset.psu.edu/pub/ger/documents/SecureFixedDiskWiping.html
Sourceforge offers dban http://dban.sourceforge.net/features.html
IBM http://www-307.ibm.com/pc/support/site.wss/document.do?lndocid=TVAN-SDD