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Forum Discussion
Image file of readynas duo drive
Hi, I have an old ReadyNas Duo that was setup as a RAID1. Unfortunately one of the drives is physically damaged, and the second drive developed bad blocks. A very bad scenario.
In any case I was able to create a 1.4TB image of the second drive using dd_rescue from a knoppix boot cd, but I don't exactly know how to recover files/folders from this image. I tried restoring the image to another drive:
dd_rescue imagefile.img /dev/sdb
And this completed "successfully", but when I inserted this drive into the readynas it just treated it like a new blank drive and installed new volumes on it.
Can someone give tips on how to go about recovering data from this image file. Any help is appreciated. Thanks in advance.
In any case I was able to create a 1.4TB image of the second drive using dd_rescue from a knoppix boot cd, but I don't exactly know how to recover files/folders from this image. I tried restoring the image to another drive:
dd_rescue imagefile.img /dev/sdb
And this completed "successfully", but when I inserted this drive into the readynas it just treated it like a new blank drive and installed new volumes on it.
Can someone give tips on how to go about recovering data from this image file. Any help is appreciated. Thanks in advance.
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- If the disk had a partition table on it (i.e. was not the parity disk which has no partition table on it) the partition table would be at the beginning of the disk, so if that part of the disk was bad I would think that could cause issues.
- Ok. Just wanted to be sure you had firmware that support 2 TB drives (you do).
As mdgm points out, if the partition table is corrupt you are in a difficult spot. You could try the tools at http://www.diskinternals.com/ and see if they can recover any data from the C partition. The ones that do partition recovery (and raid recovery) are expensive though. - I will download their raid recovery tool to see what it finds. I wouldn't mind paying for the personal license if I can see that most of the data is recoverable. I'm still running the dd command that was recommended last night, though I don't have my hopes high with that. After that I will run the dd_rescue with the -r option. If these all fail then I will test the raid recovery tools.
Thank you all for your time and help. It is deeply appreciated. - dd_rescue should be run for both directions if you were using that (first without the -r option then with, though doing the -r option then without should work too). I was referring to simply using dd for copying the image you'd already made to a good disk.
The advantage of using the -r disk is that it may be able to copy sectors reading the disk in the reverse order that could not be copied reading them normally. - Perfect, will do.
- Ok, just one quick thing. I created the image file without the -r option, ten copied to image to the new drive. Can I now just run the dd_rescue using that same image file on the new drive but give it a -r option, or do I need to use the original bad drive with the -r option?
- You would need to copy from the original bad drive with the -r option. The -r option is to pick up stuff that you couldn't copy from the bad drive reading it in the normal order.
- This is what I have from Raid Recovery so far. I'm no expert, but this doesn't look promising:
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