when you delete a file, the operating system does not really remove the file from the disk; it only removes the reference of the file from the file remains on the disk until another file is created over it , and even after that , it might be possible to recover data by studying the magnetic fields on the disk platter surface.
there are several problems in secure file removal , mostly caused the use of write , cache , construction of the hard disk and the use of data encoding . these problems have been taken into problems have been taken into consideration when Eraser was designed , and because of this intuitive design and a simple user interface , you can safely and easily erase private data from your hard drive.
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