Question : Server data erasure

Hi all,
I am beginning to do a data erasure on servers. However, I have never done this job so I don't know what to do steps by steps.
Could you give me the procedures how to do this? What tools (software) do I use for data erasure?

Answer : Server data erasure

105881#
I am asking to hide the CEWP in page & simply add the html code to that source code. then it will work fine.
<style>
.ms-viewheadertr{ display:none; }
</style>