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VeraCrypt

Documentation >> Security Requirements and Precautions >> Defragmenting

Defragmenting

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 Volume Clones), do one of the following: