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way to use this tool on a VeraCrypt volume: First, make a backup copy of the VeraCrypt volume
(because the chkdsk tool might damage the filesystem even more) and then mount it. Right-click
the mounted volume in the main VeraCrypt window (in the drive list) and from the context menu
select Repair Filesystem’.
PROBLEM:
When trying to create a hidden volume, its maximum possible size is unexpectedly small (there is
much more free space than this on the outer volume).
PROBABLE CAUSES:
1.
The outer volume has been formatted as NTFS
2.
Fragmentation
3.
Too small cluster size + too many files/folders in the root directory of the outer volume.
POSSIBLE SOLUTIONS:
Solutions Related to Cause 1:
Unlike the FAT filesystem, the NTFS filesystem always stores internal data exactly in the
middle of the volume. Therefore, the hidden volume can reside only in the second half of
the outer volume. If this constraint is unacceptable, do one of the following:
Reformat the outer volume as FAT and then create a hidden volume within it.
If the outer volume is too large to be formatted as FAT, split the volume to several 2-
terabyte volumes (or 16-terabyte volumes if the device uses 4-kilobyte sectors) and
format each of them as FAT.
Solution Related to Cause 2:
Create a new outer volume (defragmentation is not a solution, because it would adversely
affect plausible deniability see section Defragmenting).
Solution Related to Cause 3:
Note: The following solution applies only to hidden volumes created within FAT volumes.
Defragment the outer volume (mount it, right-click its drive letter in the Computer or My
Computer window, click Properties, select the Tools tab, and click Defragment Now’). After
the volume is defragmented, exit Disk Defragmenter and try to create the hidden volume
again.
If this does not help, delete all files and folders on the outer volume by pressing
Shift+Delete, not by formatting, (do not forget to disable the Recycle Bin and System
Restore for this drive beforehand) and try creating the hidden volume on this completely
empty outer volume again (for testing purposes only). If the maximum possible size of the
hidden volume does not change even now, the cause of the problem is very likely an
extended root directory. If you did not use the Default cluster size (the last step in the
Wizard), reformat the outer volume and this time leave the cluster size at Default’.
115


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