Bedienungsanleitung VeraCrypt 1.16 (Seite 125 von 162) (Englisch)

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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.

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VeraCrypt 1.16 Seite 125

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