Darik's Boot And Nuke
free erasure software
runs from boot
various types of disk rewriting to ensure data is obliterated
quick erase option for pre-OS install which writes all zeroes
Downloads:
Memtest86+
Based on the well-known original memtest86 written by Chris Brady, memtest86+ is a port by some members of the x86-secret team, now working at www.canardpc.com. Our goal is to provide an up-to-date and completly reliable version of this software tool aimed at memory failures detection.
Memtest86+ V4.20 (25/01/2011) download link:
Download - Auto-installer for USB Key (Win 9x/2k/xp/7)
(Download for the USB key is also attached below.)