TOC · About DMDE

## Known Issues and Other Limitations

### Data Recovery

- Data recovery can only be performed to another disk (partition), the target disk must be supported by the OS (e.g., in DOS/Win9x/ME you can recover data to a FAT formatted disk only)
- DOS, Win9x/ME: unicode symbols in file names outside the selected code page are replaced with underscores ("_") or transliterated according to the loaded translit tables
- DOS, Win9x/ME or FAT: files larger than 4GB can only be recovered with splitting in parts due to the FAT limitation
- File hard links are recovered as different files
- NTFS alternate data streams for directories can be recovered only after FS reconstruction
- NTFS encrypted file maximum size: 4GB
- NTFS permissions and owners are not supported
- Maximum name length supported: 255 characters
- Symbolic links, special attributes, other FS-specific options are not supported
- Win9x/ME: drives greater then 128GB are not handled correctly without special patches applied to Windows drivers
- Maximum path length supported: 259 characters for DOS, 4096 for Windows, Linux, macOS
- Maximum path length supported by DOS: 79 or 127 characters (for DOS-names) depending on DOS version.
- Subdirectory depth is up to 1024 (can be increased using maxrecoverdepth= parameter)
- If name substitution is used under DOS then name handling (such as auto renaming) is not supported

### NTFS write support

- Journal is not supported
- SECURITY INFORMATION is not supported on creation (to access files and directories it is necessary to set permissions using OS features)
- OBJECTID is not supported
- Additional creation of DOS-compatible names is not supported
- Compressed files are not supported
- Alternate data streams are not supported
- To allocate/append a file a contiguous free space is required

### Other

- the software may work within the available RAM. 32-bit versions may use up to 3GB of RAM only (up to ~10 million files/streams and 2 million directories); DOS may access even less memory
- up to 134 million directories and 1.7 billion items per directory can be handled in 64-bit versions (within available RAM blocks)
- no additional support for virtual disk image files in DOS
- NTFS alternate data streams for a file are displayed only in a single directory (no matter the file may be hard linked to multiple directories)
- up to 2K windows/panels/objects for GUI version, or width-limited for console
- up to 2K items in the list of Devices
- up to 16K custom data rotation items (striping) when constructing Custom RAID
- up to 2K visible items per section for Full Scan (showvolumesnum= parameter)
- up to 16 million MFT fragments of NTFS for Full Scan (ntfsmaxmftruns= parameter)
- maximum search depth for File Panel Search is up to 1K directories
- keyboard and mouse input is limited in Linux (keyboard shortcuts and national input may not be supported)