ddrescue (in Ubuntu it is named gddrescue) is a data recovery
tool that copies data from a file or hardware device that contains data
to another place, making every effort to rescue data in the event of
The basic operation of ddrescue is fully automatic.
we mean that the user does not have to wait for an error, terminate the
software, read the log file, and run the program in reverse. The log
file enables data to be rescued very efficiently.
Having the option not to truncate the output file allows
ddrescue to be run multiple times on the same output file, each time
attempting to fill in the gaps.
With two or more damaged copies of a file (or CD, DVD, etc)
ddrescue should be able to reconstruct a complete and error-free file.
The logfile is periodically saved to disk. In the event of a
crash you can resume the rescue with little recopying. Also, the same
logfile can be used for multiple commands that copy different areas of
file, and for multiple recovery attempts over different subsets.
ddrescue aligns its I/O buffer to the sector size so that it
can be used to read from raw devices. For efficiency reasons, the
buffer is aligned to the memory page size if page size is a multiple of
| ddrescue 1.17
Free to download
GNU GPL v3
Antonio Diaz Diaz
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to Data Recovery Home Page
- Copies data from one file or block device (hard disk,
DVD-ROM, etc) to another
- Does not truncate the output file if not asked to, so every
time you run it on the same output file, it tries to fill in the gaps
- Designed to be fully automatic
- Data is rescued very efficiently (only the needed blocks
- Log file is periodically saved to disc
- Automatic merging of backups
- Log file can be used for multiple commands that copy
different areas of the file, and for multiple recovery attempts over
- Automatic merging
- Highlights bad sectors on the disk
Last Updated Sunday, September 22 2013 @ 12:31 AM EDT