Eu encontrei este estudo de caso que menciona Heidi:
A free tool (donations accepted) that is very robust and allows you to wipe free space (more accurately called “unallocated clusters”) as well as slack space (also called “cluster tips”) is Eraser. In addition, it includes the ability to configure your system to wipe the page file at shutdown. It includes a scheduler to allow you to schedule how frequently you would like the program to run. It is a well-designed and easy to use application.
Fonte: Sans.org (PDF de 2006) - Página 11
O estudo de caso faz referência a essa comparação:
link (também de 2006)
Eles listam Eraser (quando ainda era desenvolvido por Sami Tolvanen) como Recomendado , e isso para qualquer versão que estivesse disponível naquele momento.