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Recover Data From a dead hard drive using ddrescue   
Thursday, November 30 2006 @ 08:26 PM EST
Contributed by: sde

Like dd, dd_rescue does copy data from one file or block device to another.dd_rescue is a tool to help you to save data from crashed partition. It tries to read and if it fails, it will go on with the next sectors where tools like dd will fail. If the copying process is interrupted by the user it is possible to continue at any position later. It can copy backwards.

Imagine, one of your partitions is crashed, and as there are some hard errors, you don’t want to write to this hard disk any more. Just getting all the data off it and retiring it seems to be suitable. However, you can’t access the files, as the file system is damaged.

Now, you want to copy the whole partition into a file. You burn it on CD-Rom, just to never lose it again. You can setup a loop device, and repair (fsck) it and hopefully are able to mount it.

Full tutorial

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