sorry about my English...

I have lost dates on my External hard disk with dd (I have on my External hard disk with ext4 format and have only videos and some Files), now to try the dates from my hard disk to recover. Here to find how to does it

sudo ddrescue -f -r3 /dev/sdb1 memorycard.iso memorycard.log

Why agc use two possibility , .iso and .log for save ?

else, a more question....

he give only /sdb1 not the output hard drive /sda5

maybe is well

ddrescue -f -r3 /dev/sdb1 /dev/sda5/_rescue.img /dev/sda5/rescue.log

Can Please someone explain with easy words because he does it, Thanks!

  • The info page, info ddrescue is a very good document including a tutorial with relevant examples including the command lines that you show in the question. Please read slowly twice. That is what i did in order to learn how to use it. And ddrescue has been a very useful tool for me. -- Please notice that you should use ddrescue with root privileges, so be careful and double check the target device. Good luck :-) – sudodus Sep 26 at 16:37

The man pages for ddrescue are here.

The command options tell ddrescue to


Force overwrite of block devices if you are not copying your data to a regular file. In this case the option will do nothing because you are making a copy to a regular img file.


Retry any bad sectors 3 times


The path to the damaged drive you are trying to rescue. It should be connected but not mounted. Plug the drive in and run lsblk to see the correct path.


Is just where you want to copy the rescued data to and can be any mounted drive with enough space for the copy. Don't use /dev/ paths, just normal ones into your regular file system like /home/user/whatever


Is where ddrescue will record it's progress so that if you stop it then it can resume from where it stopped and not have to start again. Again use normal path descriptions.

If the damaged drive is at /dev/sdb1 then just open a terminal in the location you want to copy the data to and run

 sudo ddrescue -r3 /dev/sdb1 rescue.img rescue.log


Once you have recovered your image then you will need to mount it. There is some help here but if you have an img file then you may find it easier to install losetup to help with the mount. You could also try specifying an iso format instead of an img and see if your file manager can open this directly (since @acg originally suggested the iso).

Once mounted you can also use testdisk to examine the iso for any deleted and lost files.

  • Very Thanks for your guidance!, one more Question, and when have my copy rescue.img on hard disk /sdc, what should I do and it to start ? – dsaj34v Sep 26 at 17:52
  • very Thanks! i wish you a nice weekend! – dsaj34v Sep 26 at 21:07

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