![]() ![]() Time is crucial on a dying hard disk, and ddrescue is the fastest of the three. Also note you can run the exact same command again when the first pass is done and the utility will use the log file to try to just recover the bad blocks again (if the log file exists the utility only tries to copy the unsuccessful blocks). With a SystemRescueCD or USB stick you can perform heroic rescues on any. Be patient, the process is a sector-by-sector copy so it takes a long time. As a consequence, changes you make on the system are not saved, and they are lost when you reboot (except what you do on the other file systems that you may have mounted). All the files of the system are stored in a large squashfs file system image file. Sudo ddrescue -r3 -v /dev/sda /dev/sdb /mnt/usb0/somerescue.logĦ. Creating a backing store Overview SystemRescue is based on a read-only compressed file system. Change the actual device identifiers based on the feed back from the command in step 3!: The GNU site describes GNU ddrescue as a data recovery tool, and lists these. Run the following command to perform a copy from the drive at /dev/sda to /dev/sdb. cdroms and memory cards using the software available in SystemRescueCD. Create a mount point for your flash key in order to save the ddrescue log file (use the actual device info from the previous command, in my example my NTFS-formatted flash key is at /dev/sdc :ĥ. In order to see the Linux device assignments run this command:Ĥ. If the target disk is larger then you will end up with unclaimed space and will need to use a partition tool to expand into this space.ģ. One caveat is that the target disk must be at least as large as the source disk. Here’s the “how-to” I created for myself. In general Ddrescue is a great tool to have when dealing with files, hard drives, or cd-roms that are damaged or have lost data. Use a Linux LiveCD as SystemRescueCd (or the rescue mode on the installation CD for Linux distribution used) to start the system where the disk is connected. When you run it on the same output file, it tries to fill in the gaps without wiping out the data already rescued. This means that if you have two or more copies of a cd or hard drive, and all the copies are damaged to some extent, Ddrescue will be able to piece together the good data from each copy, resulting in a more complete recovery. It can also merge multiple damaged copies of a file or disk to enhance the chances of 100% recovery. You can stop and resume its activity at any time as the logfile will keep track of progress and reduce redundant scanning, making to process very efficient. Ddrescue is licensed under the GNU general public license and is completely free to use.ĭdrescue is quite a powerful recovery tool that can recover data in spite of bad sectors and disk errors. It is available as a stand-alone bootable cd or as part of a multi-boot/recovery distro package such as SystemRescueCd. Ddrescue will copy data from one device such as a hard drive or cdrom, to another device (internal or external) and tries to rescue data in case of read errors. Ddrescue is software tool used for data recovery. ![]()
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