Secure File Deletion and Erasure
Caution: Do not use any of these tools without thoroughly understanding their operation. It is possible to accidentally and permanently delete needed data, up to and including everything on all of the hard drives in a computer! If you have any questions check with your Tier One or other technical support before doing anything.
DBAN hard drive wiper for PCs
Software to use on any hard drive in a "PC compatible" computer to completely remove all data. Use this software before surplusing or transferring a computer to another area. Available on the UofL IT Software Resales "Free software" site (requires valid UofL ID and password to log-in). Go to http://louisville.edu/it/itstore
Heidi Eraser - Secure file eraser for Windows PCs
Software to use on any "PC compatible" computer to eradicate individual files. Use this software to remove sensitive data from a PC that will remain in service. Allows you to target files that should be eradicated. This is free (they would like a donation) software available for download from the company's web site. Go to http://www.heidi.ie/eraser/
Permanent Eraser - Secure file eraser for MAC OS X 10.1 and later
MAC OS 10.3 natively provides support for the permanent deletion of files with the Secure Empty Trash feature, but for those who have earlier versions of Mac OS X, Permanent Eraser is the answer to ensure that your files have been securely removed. Use this software to remove sensitive data from a MAC that will remain in service. This is free software available from the company's web site. Go to: http://www.edenwaith.com/products/permanent%20eraser/
MAC OS X Disk Utility to securely delete entire hard drive
To permanently delete entire hard drive: According to Security Now podcast, "If you boot to the OS X installation disk, you can run Disk Utility from the menu bar and securely erase the whole hard drive with seven- or 35-pass secure deletion." See http://www.grc.com/sn/SN-130.htm (Thanks to Jay Barbee).