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dd_rescue copies data from one file or block device to another. It is intended for error recovery, so, by default, it doesn't abort on errors, and doesn't truncate the output file. It uses large block sizes to quicken the copying, but falls back to small blocks upon encountering errors. It produces reports that allow you to keep track of bad blocks.
Like dd, dd_rescue does copy data from one file or block device to another. You can specify file positions (called seek and Skip in dd). There are several differences:
- dd_rescue does not provide character conversions.
- The command syntax is different. Call dd_rescue -h.
- dd_rescue does not truncate the output file (unless asked to).
- You can tell dd_rescue to start from the end of a file and move backwards.
- dd_rescue does not abort on errors on the input file, unless you specify a maximum
- error number. Then dd_rescue will abort when this number is reached.
- It uses two block sizes, a large (soft) block size and a small (hard) block size. In case of errors, the size falls back to the small one and is promoted again after a while without errors.
- It does not (yet) support non-seekable in- or output.
License: GNU General Public License
Homepage: http://www.garloff.de/kurt/linux/ddrescue/
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