We recommend against using the –rN component, as damaged drives should be fully diagnosed by a professional to insure no further damage will occur by forcing it to read damaged areas. Note: Many ddrescue tutorials recommend using the –rN component (which will cause it to try N times to rescue the block) in a second cloning pass in order to force the drive to read damaged/unreadable sectors. Root# ddrescue -f -n /dev/ /root/.img /root/recovery.log Root# ddrescue -f -n /dev/ /dev/ /root/recovery.log Run the utility with the command switches/options included below in order to get a clone of the drive as safely as possible. With SystemRescueCD, you can output a list of devices by typing fdisk -1 at the root prompt. To run ddrescue, use the following format for commands:ĭdrescue infile outfile Of these options, we’d recommend using the SystemRescueCD, since it provides for a fairly simple hard disk cloning process with ddrescue. You can download the latest version of ddrescue here, or click here to download SystemRescueCD, a system rescue disk for Linux that can be used as a bootable USB stick or CD. Cloning Hard Drives with ddrescueīefore starting this process, you will need a copy of ddrescue (preferably on a CD or DVD), a fully functional hard drive, and the damaged drive. Likewise, you should not use this utility if you are at all confused by the command parameters discussed below. This guide will explain how the utility works and how different commands can affect the tool’s functionality.ĭdrescue should not be used on hard drives that make excessive sounds or that show any other signs of permanent damage. There are risks to consider - see the last section of this article for some important precautions - and it is no substitute for professional data recovery services, but it is an effective option for restoring low-priority data from a failing hard disk. It is extremely efficient, and because it doesn’t truncate files or write zeroes to its output file, it can be run successively to fill in bad sectors that were missed in earlier passes. However, if you intend to clone hard disks for any reason, it is important to use a safe process that will not introduce unnecessary risks to your data.ĭdrescue is frequently recommended for hard drive cloning, as it is a powerful, free data recovery utility and included by default in many Linux distributions. At, we recommend contacting a data recovery expert at the first sign of hard drive failure, as cloning a drive can prompt a failure and additional damage. When a hard drive starts to fail, you have a limited amount of time to take action, and many online tutorials recommend making a clone of the affected disk before it becomes completely unresponsive.
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