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attributes, or the operating system failing to perform it for various documented and
undocumented reasons). Note: When you write to a file-hosted hidden volume, the timestamp
of the container may change. This can be plausibly explained as having been caused by
changing the (outer) volume password. Also note that VeraCrypt never preserves timestamps
of system favorite volumes (regardless of the settings).
Special software (e.g., a low-level disk editor) that writes data to a disk drive in a way that
circumvents drivers in the driver stack of the class ‘DiskDrive’ (GUID of the class is 4D36E967-
E325-11CE-BFC1-08002BE10318) can write unencrypted data to a non-system drive hosting a
mounted VeraCrypt volume (‘Partition0’) and to encrypted partitions/drives that are within the
key scope of active system encryption (VeraCrypt does not encrypt such data written that way).
Similarly, software that writes data to a disk drive circumventing drivers in the driver stack of the
class Storage Volume’ (GUID of the class is 71A27CDD-812A-11D0-BEC7- 08002BE2092F)
can write unencrypted data to VeraCrypt partition-hosted volumes (even if they
are mounted).
For security reasons, when a hidden operating system is running, VeraCrypt ensures that all
local unencrypted filesystems and non-hidden VeraCrypt volumes are read-only. However, this
does not apply to filesystems on CD/DVD-like media and on custom, atypical, or non-standard
devices/media (for example, any devices/media whose class is other than the Windows device
class ‘Storage Volume’ or that do not meet the requirements of this class (GUID of the class is
71A27CDD-812A-11D0-BEC7-08002BE2092F)).
Device-hosted VeraCrypt volumes located on floppy disks are not supported. Note: You can
still create file-hosted VeraCrypt volumes on floppy disks.
Windows Server editions don't allow the use of mounted VeraCrypt volumes as a path for
server backup. This can solved by activating sharing on the VeraCrypt volume through
Explorer interface (of course, you have to put the correct permission to avoid unauthorized
access) and then choosing the option "Remote shared folder" (it is not remote of course
but Windows needs a network path). There, you can type the path of the shared drive (for
example \\ServerName\sharename) and the backup will be configured correctly.
Due to Microsoft design flaws in NTFS sparse files handling, you may encounter system
errors when writing data to large Dynamic volumes (more than few hundreds GB). To
avoid this, the recommended size for a Dynamic volume container file for maximum
compatibility is 300 GB. The following link gives more details concerning this limitation:
http://www.flexhex.com/docs/articles/sparse-files.phtml#msdn
Windows 8 introduced a new feature called "Hybrid boot and shutdown" to give users
the impression that booting is quick. This feature is enabled by default and it has side
effects on VeraCrypt volumes usage. It is advised to disable this feature (e.g. this link
explains how). Some examples of issues:
After a shutdown and a restart, mounted volume will continue to be mounted without
typing the password: this due to the fact the new Windows 8 shutdown is not a real
shutdown but a disguised hibernate/sleep.
When using system encryption and when there are System Favorites configured to be
mounted at boot time: after shutdown and restart, these system favorites will not be
mounted.
Further limitations are listed in the section Security Model.
125


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