Write support

Version 2.0 introduced write support in Disk Decipher.

Storage provider

Write support is currently supported for local and linked disks. The NFS remote storage provider is also write-enabled.

Version 3.13.3 adds initial write support to the WebDAV remote storage provider.

To support write operations on a remote disk, Disk Decipher needs to be able to submit partial update operations to the WebDAV server. Unfortunately there is no official standard for partial updates in the WebDAV RFCs, but there are two common implementations:

• Apache mod_dav, which uses the PUT method combined with a Content-Range header (note that this conflicts with RFC 7231 section 4.3.4)
• SabreDav, which uses the PATCH method combined with a X-Update-Range header

Please let me know if you know other WebDAV implementations providing partial update support.

Limitations

The initial WebDAV write support has the following limitations:

• Synchronous writes (persistent write cache support will be added to improve performance)
• Secure network connection required (no manual trust)
• The disk image is not locked on the WebDAV server while mounted

These restrictions will be relaxed in future updates.

Disk format

Write support is supported for all disk formats supported by Disk Decipher (VeraCrypt, TrueCrypt, FreeOTFE and LUKS). All cipher combinations are supported.

File system

Write support is available for all supported filesystems. More details are listed on the Filesystems overview.