Permanently Erase Data Without 3rd Party Tool, Most people think that when you erase/delete data file from your computer it is gone forever, well its not really gone until to you are overwrite the disk or until windows write new information to that part of the drive. So simply using the Windows delete key does not “deleted” that file. Even data from the Recycle Bin data can be recovered after emptying. There is free data recovery software that can recover this data easy. So I will show you how to wipe the free space of a hard driver with cipher command. This does NOT delete physical data from that hard drive, it just wipes the free space and makes it impossible to recover data after its 3 overwrite passes.
Overwrite:
First pass all zero’s – 0x00
Second pass with all 255’s, – 0xFF
Third pass with random numbers
https://technet.microsoft.com/en-gb/library/bb490878.aspx
I will also show you 2 other methods, sdelete and ccleaner
SDelete is a command line utility that helps to cleanse the free space on a logical disk. SDelete accepts wild card characters as part of the directory or file specifier.
-a Remove Read-Only attribute.
-c Clean free space.
-p passes Specifies number of overwrite passes (default is 1).
-q Don’t print errors (Quiet).
-s or -r Recurse subdirectories.
-z Zero free space (good for virtual disk optimization).
https://technet.microsoft.com/en-us/sysinternals/sdelete.aspx
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