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Forum Discussion
DTschoolIT
Aug 02, 2012Aspirant
cannot access data volume or web utility # 19117808
Hello, In november, i replaced disk 2 (readynas pro bus edition) due to failure. this morning i got the same error, thought maybe had something to do with the drive bay itself. after trying the ...
mdgm-ntgr
Aug 08, 2012NETGEAR Employee Retired
Another option for attempting to clone the disk would be to use dd_rescue though from what siigna has said it sounds like the disk has failed pretty badly, but it's still worth a try.
If you really need your data back going to a data recovery company would be the best option but they can be very expensive. Having a good backup just in case would have been much cheaper. Regardless of the outcome I hope you backup your data regularly in future. Multiple disk failures is one of multiple problems that can take out an array. See Preventing Catastrophic Data Loss
readysecure1985 wrote:
Here is a simple guide to quickly recover a failed drive using dd_rescue.
I often have to deal with pesky failed drives, so here is a quick simple guide how to achieve this with a free Linux Live CD and a PC with two SATA connections.
I will be using a Knoppix 6.2 Live CD for this guide. Can be found at http://www.knoppix.net
Using dd_rescue command allows you to copy data from one drive to another block for block. This is especially useful for recovering a failed drive. Often when a drive fails, the drive is still accessible, it has just surpassed the S.M.A.R.T. error threshold. dd_rescue allows you to ignore the bad sectors and continue cloning the bad drive to a new healthy drive.
1) Connect your old drive and new drive to your PC
2) Boot up using your Linux live CD
3) Launch a terminal window.
4) Run fdisk -l to make sure the system sees both of the hard drives.
5) Run hdparm -i /dev/sdx on both of the drives to find which drive is your source drive and which drive is your destination drive
6) Once you know which drive is which you can start the clone process.
dd_rescue /dev/sdx(source disk) /dev/sdx(destination drive)
7) You will see the process start, just keep an eye on it, it might take a few hours for the clone job to finish, depending on the size of the drive.
Once the process is complete, there will be no notification, the transfer will just stop and you will see the terminal prompt again.
If you see a lot of errors or see that there is no more data being shown as succxfer: it means the drive got marked faulty by the kernel. At this point reboot the system and make sure you know which drive is which again, as it is possible they lettering might switch. Run the dd-rescue command again but this time with -r option. This will start the cloning again but this time will start from the back of the drive and will make sure to get the data that has not been cloned yet.
There is no guarantee this will recover your data, but there is a very high chance this will work and its free…
If you really need your data back going to a data recovery company would be the best option but they can be very expensive. Having a good backup just in case would have been much cheaper. Regardless of the outcome I hope you backup your data regularly in future. Multiple disk failures is one of multiple problems that can take out an array. See Preventing Catastrophic Data Loss
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