Description: When we delete a file, actually it isn't removed from the disk.The content will be on the disk until another file is written over it.
same is true for formating the hard disk. Most of the data are still on disk and can be recovered with some suitable tools.
this video is a simple demo of tool named wipe used for securely delete a file and folder from linux (Backtrack in this case).
This utility is also useful to clean a hard drive by replacing the file location with the correct device location. It is present in backtrack and
can be found with the Start Menu--Backtrack--Digital Forensics--Anti Forensics--Wipe.
Syntax:
wipe "filename"
wipe -r "foldername"
Source : lecturesnippets from Youtube
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Normal deletion can be recovered easily so always use some utility likr wipe.
is it for window also ?
There are other tools for window to secure delete. please google it.