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+<title>VeraCrypt - Free Open source disk encryption with strong security for the Paranoid</title>
+<meta name="description" content="VeraCrypt is free open-source disk encryption software for Windows, Mac OS X and Linux. In case an attacker forces you to reveal the password, VeraCrypt provides plausible deniability. In contrast to file encryption, data encryption performed by VeraCrypt is real-time (on-the-fly), automatic, transparent, needs very little memory, and does not involve temporary unencrypted files."/>
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+<div class="wikidoc">
+<h1>Defragmenting</h1>
+<p>When you (or the operating system) defragment the file system in which a file-hosted VeraCrypt container is stored, a copy of the VeraCrypt container (or of its fragment) may remain in the free space on the host volume (in the defragmented file system).
+ This may have various security implications. For example, if you change the volume password/keyfile(s) afterwards, and an adversary finds the old copy or fragment (the old header) of the VeraCrypt volume, he might use it to mount the volume using an old compromised
+ password (and/or using compromised keyfiles that were necessary to mount the volume before the volume header was re-encrypted). To prevent this and other possible security issues (such as those mentioned in the section
+<a href="Volume%20Clones.html"><em>Volume Clones</em></a>), do one of the following:</p>
+<ul>
+<li>Use a partition/device-hosted VeraCrypt volume instead of file-hosted. </li><li><em>Securely</em> erase free space on the host volume (in the defragmented file system) after defragmenting. On Windows, this can be done using the Microsoft free utility
+<code>SDelete</code> (<a href="https://technet.microsoft.com/en-us/sysinternals/bb897443.aspx" rel="nofollow">https://technet.microsoft.com/en-us/sysinternals/bb897443.aspx</a>). On Linux, the
+<code>shred</code> utility from GNU coreutils package can be used for this purpose.&nbsp;
+</li><li>Do not defragment file systems in which you store VeraCrypt volumes. </li></ul>
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