GNU ddrescue is a data recovery tool. It copies data from one file or block device (HDD, CD-ROM, DVD, etc) to another, trying hard to rescue data in case of read errors.
The basic operation of ddrescue is fully automatic. You don't have to wait for an error, stop the program, read the log, run it in reverse mode, etc.
Ddrescue 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.
If you use the logfile feature of ddrescue, the data is rescued very efficiently (only the needed blocks are read). Also you can interrupt the rescue at any time and resume it later at the same point.
Automatic merging of backups: If you have two or more damaged copies of a file, DVD, CD-ROM, etc, and run ddrescue on all of them, one at a time, with the same output file, you will probably obtain a complete and error-free file. This is so because the probability of having damaged areas at the same places on different input files is very low. Using the logfile, only the needed blocks are read from the second and successive copies.
The logfile can be used for multiple commands that copy different areas of the file, and for multiple recovery attempts over different subsets. The same logfile is periodically saved to disc. So in case of a crash you can resume the rescue with little recopying.
gddrescue aligns its I/O buffer to the sector size so that it can be used to read from raw devices. For efficiency reasons, also aligns it to the memory page size if page size is a multiple of sector size.
Homepage: http://www.gnu.org/software/ddrescue/ddrescue.html Download: http://ftp.gnu.org/gnu/ddrescue/ddrescue-1.6.tar.bz2 RPM packages: http://dag.wieers.com/rpm/packages/ddrescue/ Debian packages: http://packages.debian.org/gddrescue Archive of mailing list: http://lists.gnu.org/mailman/listinfo/bug-ddrescue Mirror: http://www.gnu.org/prep/ftp.html
