|Maintainer:||Antonio Diaz Diaz|
ddrescue is a raw disk imaging tool that "copies data from one file or block device to another, trying hard to rescue data in case of read errors." The application is developed as part of the GNU project and has written with UNIX/Linux in mind.
ddrescue and dd_rescue are completely different programs which share no development between them. The two projects are not related in any way except that they both attempt to enhance the standard dd tool and coincidentally chose similar names for their new programs.
From the ddrescue info pages:
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.
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.
The basic operation of ddrescue 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 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, cdrom, 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 package 'ddrescue' actually is dd_rescue, another dd-like program which does not maintain a recovery log.
aptitude install gddrescue
First you copy as much data as possible, without retrying or splitting sectors:
ddrescue --no-split /dev/hda1 imagefile logfile
Now change over to raw device access. Let it retry previous errors 3 times, don't read past last block in logfile:
raw /dev/raw/raw1 /dev/hda1
ddrescue --max-retries=3 --complete-only /dev/raw/raw1 imagefile logfile
If that fails you can try again (still using raw) but retrimmed, so it tries to reread full sectors:
ddrescue --retrim --max-retries=3 --complete-only /dev/raw/raw1 imagefile logfile
You can now use ddrescue (or normal dd) to copy the imagefile to a new partition on a new disk. Use the appropriate filesystem checkers (fsck, CHKDSK) to try to fix errors caused by the bad blocks. Be sure to keep the imagefile around. Just in case the filesystem is severely broken, and datacarving tools like testdisk need to to be used on the original image.
These two examples are taken directly from the ddrescue info pages.
Example 1: Rescue an ext2 partition in /dev/hda2 to /dev/hdb2
ddrescue -r3 /dev/hda2 /dev/hdb2 logfile
e2fsck -v -f /dev/hdb2
mount -t ext2 -o ro /dev/hdb2 /mnt
Example 2: Rescue a CD-ROM in /dev/cdrom
ddrescue -b 2048 /dev/cdrom cdimage logfile
write cdimage to a blank CD-ROM