Last week somebody did asked me "how to completely remove data from my hard drive?"
So i found this tool called Eraser . Pemadam lah pemadam!!
Actually when you delete a file (rite click >delete) the data is not quite "gone". The operating system will only remove the reference of the file from the file system table. It works like a table of content in any books that you have read (or like your final year project report :P). So the file actually remains on the disk until another file is created over it. There are severals undelete utility that can recover these files back.
For more info , Secure Deletion of Data From Magnetic and Solid State Drive .
gr33tz : apek for this post
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