市场上有很多免费的数据恢复软件(free data recovery software)。如果您想知道他们如何能够轻松地恢复您的数据，答案是数据根本没有从您的系统中删除。当您清空系统的回收站或使用SHIFT+DEL删除文件或文件夹时，操作系统只会将该空间标记为未占用。稍后，当新数据写入同一位置时，原始数据将被完全删除。
适用于Windows 10(Windows 10)的免费安全删除(Secure Delete)软件
对于那些打算永久删除机密数据的人来说，这可能是个问题。以无法恢复的方式删除数据的删除工具称为安全删除软件产品。让我们来看看一些适用于Windows 10/8/7的免费安全橡皮擦或碎纸机软件：
- 安全删除
- 自由激光
- 防止还原
- 碎纸机8
- 文件橡皮擦
- 永久删除
- 覆盖
- PCDiskEraser
- 文件粉碎机
- 智能磁盘清理
我们已经了解了Free File Wiper、SDelete、Cipher、Microsoft Surface Data Eraser、CCleaner、DBAN、OW Shredder和DeleteOnClick。现在让我们来看看一些更安全的删除(Delete)软件。
1]安全删除
SecureDelete软件使用Gutmann和DOD 5220.22M算法(DOD 5220.22M)安全(SecureDelete)地覆盖已删除的文件，使文件永远无法恢复。它还使用另一种速度更快但安全性较低的算法来安全地删除您的文件。程序很简单。使用选项在应用程序上添加文件或文件夹，然后单击选项将其删除。在应用程序上选择清空回收站(Empty Recycle Bin)以安全地删除文件和文件夹。
SecureDelete 还具有在关机时清除页面文件的选项。(clear the paging file)分页文件作为RAM的补充，一些专家黑客可以使用它来恢复安全删除的数据。因此(Thus)，SecureDelete是一款出色的免费软件，可用于保护您的数据。在公司网站上查看更多信息(here)。
阅读(Read)：什么是数据剩磁(Data Remanence)？
2] Freeraser
Freerazer使用“粉碎”技术安全地删除数据。它粉碎了已删除数据占用的空间。这样，数据变得不可恢复。软件在删除前将数据修改为不可读的内容，然后在普通删除后粉碎数据占用的空间。这样，简单的数据恢复工具就无法恢复已删除的数据。但是，此过程并非万无一失。专家可能能够通过检查页面文件来检索您删除的部分数据，尽管这种情况很少发生。该工具可以从freeraser.com下载。
3]防止恢复
防止恢复(Prevent Restore)是另一种数据删除软件，它用无用的值替换空白空间，因此数据恢复软件产品不能用于检索数据。除了在硬盘上，它还可以用于USB驱动器、外部硬盘驱动器、记忆棒等。唯一的限制是免费软件不支持 CD 和DVD(DVDs)。你可以在他们的官方网站上阅读(here)更多关于它的信息。
阅读(Read)：如何将硬盘和 MFT 擦干净(How to wipe Hard Disk and MFT clean)。
4]碎纸机8
该应用程序由Apparillos于2013 年5 月(May 2013)发布。最新更新使该应用程序比其早期版本更快、更高效 300 倍。您可以同时永久删除文件内容和多个目录。从Microsoft Store免费下载此文件橡皮擦软件。此应用程序通过清除 Windows 10 PC 上任何可写存储设备中的嵌套文件夹来释放空间。
5]文件橡皮擦
File Eraser软件可批量删除文件以快速清理磁盘空间。该应用程序由 LC Enterprises 于 2016 年初发布。您将在此处( here)找到此应用程序。它占用的存储空间不到 9MB。它可以根据您的需要过滤文件和文件夹，并删除选定的文件和文件夹，或全部删除。
6]永久删除
此应用由 Developer's Tree于 2017年开发。 PermaDelete确保永久删除所有不必要的文件，而不是进入回收站(Recycle Bin)。这个应用程序将粉碎所有不必要的文件和文件夹。您只需要选择它们并点击“删除”。从Microsoft Store下载(Download)此免费应用程序，您就可以排序了。
7]覆盖
顾名思义，Overwrite是一种软件，它覆盖了通过常规进程删除的数据所占用的空间，使其无法通过数据恢复软件恢复。但是，与此列表中的任何其他软件不同，它使用命令行来替换空格。您可能需要一些有关系统配置的信息。软件的复杂性确保它能够正确地完成工作。它可以从这里(here)下载。
8]PCDiskEraser
PCDiskEraser是一款免费且易于使用的软件产品。它符合DoD 5220.22规范，是那些打算归还租用计算机或处置资产的人的完美产品。PCDiskEraser的团队正试图针对使用共享系统的企业用户和打算进一步出售旧电脑的用户。它可以从他们的官方网站下载。
9]文件粉碎机
File Shredder应用程序的作者认为，每个人都应该享有隐私权，用于删除机密文件的软件应该是免费的。文件粉碎机(File Shredder)软件以无法恢复的方式粉碎您删除的机密文件。它填补了普通删除文件和文件夹后标记为未占用的空间，使简单的数据恢复软件无法检索文件。虽然仍然可以使用一些复杂的程序来恢复已删除数据的碎片，但该工具可以算作非常有用的工具。请在公司的官方网站上阅读更多信息(here)。
10]智能磁盘清理
这个 Smart PC Solutions应用程序可以帮助您通过几次简单的点击来摆脱所有不必要的文件。清理过程既安全又简单。它可以释放千兆字节的磁盘空间。从Microsoft Store下载(Download)此免费软件，以摆脱临时文件、缓存、浏览器 cookie、过时的大文件、各种重复文件以及您选择的任何文件。
阅读下一篇(Read next)：如何安全可靠地处理旧电脑(How to Securely and Safely dispose of old Computers)。
Best free Secure Delete software for Windows 10
A lot of free data recovery software are available in the market. If you wonder how they are able to recover your data easily, the answer is that the data wasn’t deleted from your system at all. When you empty your system’s recycle bin or use SHIFT+DEL to delete a file or folder, the operating system merely marks that space as unoccupied. Later, when new data is written at the same location, the original data gets completely deleted.
Free Secure Delete software for Windows 10
This could be a problem for those who intend to permanently delete confidential data. The deletion tools which delete data in a manner that cannot be recovered are called secure delete software products. Let’s take a look at some free secure eraser or shredder software for Windows 10/8/7:
- SecureDelete
- Freeraser
- Prevent Restore
- Shredder8
- File Eraser
- PermaDelete
- Overwrite
- PCDiskEraser
- File Shredder
- Smart Disk Cleanup
We have already taken a look at Free File Wiper, SDelete, Cipher, Microsoft Surface Data Eraser, CCleaner, DBAN, OW Shredder, and DeleteOnClick. Now let us take a look at some more Secure Delete software.
1] SecureDelete
The SecureDelete software securely overwrites deleted files using the Gutmann and DOD 5220.22M algorithms so that the files can never be recovered. It also uses another faster, though less secure algorithm to securely delete your files. The procedure is simple. Use the options to add files or folders on the app and then click on the option to delete them. Select Empty Recycle Bin on the app to securely delete the files and folders.
SecureDelete also has options to clear the paging file at shutdown. Paging files work as a supplement of the RAM and some expert hackers can use it to recover securely deleted data. Thus, SecureDelete is excellent free software for protecting your data. Check more about it on the company website here.
Read: What is Data Remanence?
2] Freeraser
Freerazer uses the “shredding” technique to securely delete data. It shreds the space occupied by your deleted data. This way, the data becomes unrecoverable. The software modifies the data into something unreadable before deleting it and then shreds the space occupied by the data after ordinary deletion. This way, simple data recovery tools cannot retrieve the deleted data. However, this procedure isn’t fool-proof. Experts might be able to retrieve a part of your deleted data by checking through the paging file, though that rarely happens. The tool can be downloaded from freeraser.com.
3] Prevent Restore
Prevent Restore is another data deletion software that replaces the empty space with useless values so data recovery software products cannot be used to retrieve the data. Other than on the hard drive, it could be used for USB drives, external hard drives, memory sticks, etc. The only limitation is that the free software doesn’t support CDs and DVDs. You could read more about it on their official website here.
Read: How to wipe Hard Disk and MFT clean.
4] Shredder8
This app was published by Apparillos in May 2013. The latest update has made the app 300 times faster and more efficient than its earlier versions. You can permanently delete file contents and multiple directories simultaneously. Download this file eraser software from the Microsoft Store for free. This app frees up space by cleaning nested folders from any writable storage device on your Windows 10 PC.
5] File Eraser
The File Eraser software deletes files in bulk for quick disk space clean-up. The app was published by L.C. Enterprises early in 2016. You will find this app right here. It takes less than 9MB of storage space. It can filter files and folders according to your need and delete selected ones, or all of them.
6] PermaDelete
This app was developed by Developer’s Tree in 2017. PermaDelete ensures that all unnecessary files are permanently deleted instead of going to the Recycle Bin. This app will shred all unnecessary files and folders. You just need to select them and hit ‘Delete’. Download this free app from the Microsoft Store and you’re sorted.
7] Overwrite
As then name specifies, Overwrite is a software that overwrites the space occupied by the data deleted through the regular process so that it cannot be recovered through data recovery software. However, unlike any other software on this list, it uses command lines to replace the space. Some information about your system’s configuration might be needed from your end. The complexity of the software assures that it does its job right. It could be downloaded from here.
8] PCDiskEraser
PCDiskEraser is a free and easy-to-use software product. It meets DoD 5220.22 specification and is a perfect product for those who intend to return their leased computers or dispose of the assets. The team at PCDiskEraser is trying to target corporate users who are using shared systems and those who intend to sell their old computers further. It is available for download from their official website here.
9] File Shredder
The author of the File Shredder app believes that everyone deserves the right to privacy and software meant for deleting confidential files should be free of cost. The File Shredder software shreds your deleted confidential documents in a manner that they cannot be recovered. It fills up the space marked as unoccupied after the ordinary deletion of files and folders so that simple data recovery software cannot retrieve the files. While a few complicated procedures could still be used to recover fragments of the deleted data, this tool could be counted as a very helpful one. Please read more about it on the company’s official website here.
10] Smart Disk Cleanup
This Smart PC Solutions app helps you get rid of all unnecessary files in a few simple clicks. The cleanup process is safe and easy. It can free up gigabytes of your disk space. Download this freeware from the Microsoft Store to get rid of temp files, cache, browser cookies, obsolete large files, all kinds of duplicate files, and any file you choose.
Read next: How to Securely and Safely dispose of old Computers.
