That’s basically cloning the failing partition/disk to another disk. If you’ve another disk with at least the same size or bigger you can use that one too of course. This file can be later mounted to copy files out of that image file. Luckily I had enough space on another disk to store the recovered data there in a file. In my case /dev/sdb1 was the partition on a Western Digital 4TB HDD I wanted to rescue. It looked like the right tool for the job (and it turned out it was right tool 😉 ). It copies data from one file or block device (hard disc, CDROM, etc) to another, trying to rescue the good parts first in case of read errors.
GNU ddrescue is a data recovery (and cloning) tool. Searching the Internetz a little bit I finally decided to use ddrescue.
#Data rescue 3 clone drive Offline
SMARTĪfter recognizing that something is wrong with the disk I installed GSmartControl utility to have a look what the SMART values are all about and it looked like this:Īs you can see in the picture the values for Raw Read Error Rate, Current Pending Sector Count and Offline Uncorrectable are already beyond zero. But I wanted to keep all my data and since it was at least still possible to access the disk I tried to recover the data that was not in my backup. Monitoring the SMART values would have most probably shown that the disk is about starting to die. And of course I also didn’t recognized that the S.M.A.R.T (or SMART in short) values got worse over time. So sooner or later it of course happened and some data wasn’t readable anymore on a Western Digital 4TB HDD magnetic disk. So it was ok for me to loose some not so important data which I excluded from the backup. I had a similar situation but I actually had a working backup - at least a partial one 😉 But that was intentional because my backup disk wasn’t that big to fit all the data I had to backup. So you have a backup of all your data, right? 😉 But maybe you never tested it and now the disk is starting to fail and the backup is not usable.
With every access to the disk chances rise that more data might become inaccessible. Before you try to recover data on a failing hard disk please strongly consider this advice: If your “life depends” on getting back data on a failing hard disk you should REALLY(!) contact a company which has specialized on recovering data from hard disks or other media like USB sticks and so on! Don’t try to do the recovery on your own in such a case.
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