Overwriting the entire disk and installing a fresh operating system is the only way to be 100% certain that records of a file have been erased. Also be careful that the search itself does not leave a record! The probability that the file's contents may persist is lower, but not impossible. by using a command like grep -ab /dev/ on Linux) will tell you if the data is present in plaintext, but it won't tell you if some program has compressed or otherwise coded references to it. Some of you may be wondering, "Could I search the raw data on the disk to see if there are any copies of the data anywhere?" The answer is yes and no. Overwriting the entire disk is the only way to be 100% sure the name is gone. It is safe to assume that even if a file has been securely deleted, its name will probably continue to exist for some time on your computer. It's hard to know how to respond to this problem. In practice, there may be dozens of programs that behave like this. On a Linux or other *nix system, OpenOffice may keep as many records as Microsoft Office, and a user's shell history file may contain commands that include the file's name, even though the file has been securely deleted. Office might sometimes even keep temporary files containing the contents of the file. New hard drives: no technology currently exists that can read after even one overwrite.īut still: It is difficult, if not impossible, to securely delete both individual files and free space. Linux: Install Nautilus Wipe, open the Nautilus file manager, right click on file or folder, WipeĪndroid: Install Android Eraser, start it, free version wipes up to 10 MB a day Windows: Install Eraser, open Explorer, right click on file or folder, eraser, erase.Īlso erase available (free) space on all storage media: right click on the storage media … have not tested this yet if it does not destroy the system. Instead you either encrypt the entire volume and dispose of the key to wipe, or you destroy the device. Solid state hard drives: wear levelling means you cannot overwrite securely. This does not work for SDDs, flash drives, flash sticks, as their disk management stores the file in places which can not be addressed by other tools directly. Secure delete – erase – wipe for files and folders
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