DDRescue-GUI

Stop and Resume recovering lead into change of recover proceduce.

Asked by Kenneth Ko

Hi,

I wonder if you could give me some advice. I am new to ubuntu and ddrescue-GUI.

I am now running ddrescue-GUI to pull data from my malfunction external harddisk ( 1TB ) to an img file.

I have finish 1st phrase pass 1 and running pass 2 ( backward ) for some time

Then for some reasons I stop and resume the recovery several times.

For the 1st time I stop and resume, I notice that dd-rescue no longer running pass 2 (backward) and go back to pass 1 ( forward ). I am sure pass 2 doesn't finish yet. because it had just start not for very long time. When it go back to pass 1, the process goes slower than before.

For the 2nd time I stop and resume, I notice that dd-rescue no longer shows the number of non-tried blocks ( which its usually shows ) and start showing information like number of bad sectors and unreadable data. And the process goes really slow starting from here. ( 3000 days left ! ) Althrough The screen shows it is still copying the non-tried blocks

I have a look of the size of the img file and it is 1TB now. The rescued data is about 477 G and non-tried about 520 G. The GNU ddrescue version is 1.19 as shown on the terminal output window.

My questions are :

1) Have I missed useful process to resume the data ( such as reading backward in Pass 2 ) due to stop and resume the process ?
2) Can I stop the process again and do a different setting ( read backward ) and resume the recovery in order to recover more data ? Will it make the process goes even slower ? Any advice ?
3) Why stop and resume change the on-going action of the recovery process ? Have I done anything wrong to reduce the chances of more data to get recovered ?
4) If all the recovering is finsh, and I get an finished img file, is there anything I can do ( without redo the process all over again ) to re-try to recover the un-recovered data ? I am fear I have done something wrong ( by stop and resume the process not in a correct timing ) and miss good chance of recovery by using dd-rescue-GUI.

Thanks for any help. : )

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Hamish McIntyre-Bhatty (hamishmb) said : 		#1

Hi,

1) No, what you're doing seems fine to me :)

2) You can do that, and it should be just fine. The speed is more about how different areas of the drive are more and less damaged than anything else.

3) I'm not entirely sure why this happened, but perhaps you installed a different version of ddrescue in between attempts? Or did you resume the recovery using a different computer with a different OS on it?

4) Yep, go to settings in the GUI and select an option from the "No. of times to retry bad sectors" checkbox. The default of 2 should be fine. If you can't get all of your data back you may be able to read it anyway, perhaps with help from other tools like formost and photorec :)

Hope this helps,
Hamish

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