Free Secure File / Disk Deletion Utilities

Wipe your files / disks destructively

Free Secure (Destructive) File and Disk Deletion Tools

The utilities on this page allow you to destructively wipe / delete / erase a file, a disk (floppy disks, hard disks, etc), or a partition. This is usually accomplished by overwriting the existing data on the disk or file with either random numbers or a series of zeros and ones (or some such bit patterns). The tools are useful if you want to make it difficult for people to recover deleted data from your disk. You could say that these tools are the computer equivalent of an electronic or digital file shredder for files, hard disks, etc.

Incidentally, if you have the commercial Terabyte's BootIt Collection, and you only want to securely wipe an entire partition or hard disk, you can already do that with that software. That is, you don't have to download another tool to do it. (For those who don't know what that program is, it is a partition manager, backup and imaging utility and multi-boot manager, all rolled into one.) The advantage of using BootIt is that it lets you create a bootable USB drive (eg flash/thumb drive) that works out-of-the-box on modern UEFI systems, so that you don't have to jump through hoops to get the program to work.

Note that if you are concerned about the security of your data or simply wish to protect your privacy, you may also want to look at the Free Data Encryption and On the Fly Encryption page. Your data will be less easily recoverable if it is encrypted from the start.

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Free Secure Delete / Wipe Files / Wipe Disk / Destructive Delete

Eraser Secure Data Removal Tool

Eraser is a Windows utility that allows you to securely erase files, file slack space or cluster tips (the space that is not occupied by the data in a file, but nonetheless allocated to that file by the operating system), Windows virtual memory swap file, unused space on a hard disk, or an entire hard disk or floppy disk or Zip disk or the like. It is able to wipe data using pseudo-random data (or any combination of data that you specify), any number of times you wish (eg, once, or using the US Department of Defense (DOD) recommendations of either 3 times or 7 times, or the Gutmann recommendation of 35 times, etc). It is also able to erase the filenames in the directories for files you delete. The program is open source and works under Windows.

SysInternals SDelete

SDelete is a secure delete application that can overwrite a disk's unused or unallocated space, or securely delete existing files. It implements the US Department of Defense clearing standard DOD 5220.22-M, and you can specify the number of overwrite passes it makes. It can also wipe Windows NT/2K compressed, encrypted and sparse files (it uses Windows defragmentation API to accomplish this), and clears the NTFS Master File Table (MFT). (It does not delete the filenames of your files in the free disk space though - apparently it is not possible to do this in NT/2K.) This program comes with source code and works under Windows 95, 98, NT 4.0 and Windows 2000. It is a command line utility from Microsoft's SysInternals tools.

Darik's Boot and Nuke

Darik's Boot and Nuke, or DBAN for short, is a utility that you use when you want to completely obliterate all your data in all your hard disks and their partitions. It comes in the form of a bootable floppy disk or a bootable CDROM image (you download whichever you prefer), complete with an operating system (Linux) and the Boot and Nuke utility. Once you boot up that floppy (or CDROM), the utility will proceed to destroy all your data in every partition of every hard disk. The site says that it is designed for bulk or emergency data destruction. (It is probably also useful in less dramatic cases, such as when you want to wipe your disks prior to giving your computer away to someone.)

Secure Erase

Unlike the other disk wiping software on this page, this tool makes use of the built-in facility provided by the ATA specifications to erase a hard disk. It sends hard disks that support this specific ATA command an instruction to securely erase the hard disk. The hard disk's own internal hardware then carries out the command. The program must be copied onto a bootable DOS disk, and the system rebooted to this disk before the program can be run. That is, the program must be run directly under DOS, and not in a command prompt in Windows or some such thing. Note that this software is no longer being updated or maintained.

Wipe Secure File Deletion

Wipe, a secure file wiping tool for Linux, destructively deletes files by overwriting its data using a pseudorandom data. It is open source.

Active@ KillDisk Freeware

This DOS program allows you to wipe all data on a physical drive (hard disk, zip drives, floppy drives). You can display information about the drive, including data present in any sector on the drive before wiping. The program only writes zeros to the drive.


Autoclave is an open source drive sterilization utility that wipes a hard disk multiple times. You run it from a bootable floppy disk, which you create after downloading the file. It requires an x86 PC. Note that this software is no longer supported nor maintained.

Secure Delete

[Update: this software is no longer available.] Secure Delete is a Windows program that erases files or directories after filling them with random data. It comes with source code. Their site warns that the utility does not meet the requirements of the US DoD or the UK Ministry of Defense. According to one of my visitors, the program is also not able to securely delete files that are compressed by Windows' built-in NTFS file system compression.

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