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gddrescue 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.
The basic operation of gddrescue is fully automatic. That is, you don't have to wait for an error, stop the program, read the log, run it in reverse mode, etc. If you use the logfile feature of gddrescue, 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, cdrom, etc, and run gddrescue 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 is periodically saved to disc. So in case 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 the file, and for multiple recovery attempts over different subsets.
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.
Please note that this is the GNU ddrescue version providing the ddrescue executable. The package is named gddrescue because the ddrescue version of Kurt Garloff used to have the ddrescue package name already.
Description GNU ddrescue is a data recovery tool. It copies data from one file or block device (hard disc, cdrom, etc) to another, trying hard to rescue data in case of read errors. Ddrescuelog is a tool that manipulates ddrescue logfiles, shows logfile contents, converts logfiles to/from other formats, compares logfiles, tests rescue status, and can delete a logfile if the rescue is done. Ddres more»
GNU ddrescue for Debian ----------------------- Please be aware that data rescuing using GNU ddrescue can flod your logs if there are any read errors on the medium you are reading from (see #427268 as example). Consider disabling logging if you aren't interested in the logs or don't have the according resources for it. -- Michael Prokop <firstname.lastname@example.org>, Thu Aug 13 16:04:01 CEST 2009
Changes in version 1.16: The new option "-K, --skip-size" has been added. The new option "-T, --timeout", which sets the maximum time allowed since the last successful read, has been added. The short name of option "--try-again" has been changed to "-A". Maximum skip size is now limited to 1% of infile size or 1 GiB (whichever is smaller), rounded to the next multiple of sector size. The curr more»
DDRESCUE(1) User Commands DDRESCUE(1) NAME ddrescue - data more»
DDRESCUELOG(1) User Commands DDRESCUELOG(1) NAME ddrescuelog - to more»
gddrescue (1.16-1) unstable; urgency=low * [4d25099] Bump Standards-Version to 3.9.3. * [4106a7 more»
2012-06-11 Antonio Diaz Diaz <email@example.com> * Version 1.16 released. * Added new option more»
Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/ Upstream-Name: ddrescue Up more»