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Linux/macOS: enable quick format for file containers

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Allow normal file-hosted containers to use quick format in the Unix volume creation path by sizing the host file with ftruncate before backup headers are written.

Enable the GUI checkbox for normal file containers and honor --quick in text mode. Update the Unix HTML documentation for the weaker deniability properties of sparse or unwritten host regions.
This commit is contained in:
Mounir IDRASSI
2026-05-21 16:17:52 +09:00
parent 1fd2fb06cd
commit 79bee911be
10 changed files with 67 additions and 12 deletions
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doc/html/en/Creating New Volumes.html
+3 -2
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@@ -56,10 +56,11 @@ Note that the output of a hash function is <em>never </em>used directly as an en
<p>This allows you to select the encryption algorithm with which your new volume will be encrypted. Note that the encryption algorithm cannot be changed after the volume is created. For more information, please see the chapter
<a href="Encryption%20Algorithms.html"><em>Encryption Algorithms</em></a>.</p>
<h3 id="QuickFormat">Quick Format</h3>
<p>If you are not sure whether to enable or disable Quick Format, we recommend that you leave this option unchecked.</p>
<p>If unchecked, each sector of the new volume will be formatted. This means that the new volume will be
<em>entirely </em>filled with random data. Quick format is much faster but may be less secure because until the whole volume has been filled with files, it may be possible to tell how much data it contains (if the space was not filled with random data beforehand).
If you are not sure whether to enable or disable Quick Format, we recommend that you leave this option unchecked. Note that Quick Format can only be enabled when encrypting partitions/devices, except on Windows where it is also available when creating file containers.</p>
<p>Important: When encrypting a partition/device within which you intend to create a hidden volume afterwards, leave this option unchecked.</p>
For file containers, the host filesystem may create sparse or unwritten regions, which can reveal unused areas and reduce plausible deniability. Host allocation behavior depends on filesystem sparse-file support. On filesystems without sparse-file support, creating the container may allocate most or all of its space immediately or fail if there is not enough host space. The encrypted filesystem may also report more free space than the host filesystem can actually provide. If host space runs out, later writes may fail or corrupt the encrypted filesystem. Quick Format is available for normal file containers and when encrypting partitions/devices.</p>
<p>Important: When creating an outer volume within which you intend to create a hidden volume afterwards, do not use Quick Format.</p>
<h3 id="dynamic">Dynamic</h3>
<p>Dynamic VeraCrypt container is a pre-allocated NTFS sparse file whose physical size (actual disk space used) grows as new data is added to it. Note that the physical size of the container (actual disk space that the container uses) will not decrease when
files are deleted on the VeraCrypt volume. The physical size of the container can only