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huehnerhose
n00b
Joined: 26 Jun 2003
Posts: 56
Location: Berlin
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 Posted: Sun Dec 17, 2006 10:11 pm Post subject: crashed HDD, many badblocks |
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Hi!
I've got a crashed HDD (Seagate 40GB 2,5") in the notebook of my dad. There was a FAT-Filesystem on the first partition, NTFS on the extended second partition and a third primary FAT partition. Yeah... *shame* it was a Windows Notebook...
After some tries I fínally got knoppix booting and run testdisk, writing a new partition table and so on. (Gentoo install disk and normal knoppix bootoptions freezed while examining the HDD for partitions)
Finally (and caused by desperation) I tried a seagate DiscAnalyzing tool... that tool tested badblocks (I just didn't want to run badblocks... I was afraid of the result) And yeah... He says the Disk has about 4800 Blocks... so lets say... 4600 are badblocks... something definitly wrong 
The desperated question: Any idea how rescue some data? (I really don't think there is any hope, well maybe thos around 200 not badblocks are the most important data  )
The more interesting question: How could it happen that the HDD crashes that way during one simple reboot?!
For me it seems the whole HDD is scrap now... but 10minutes before it seemed to work normal... I don't understand how it could happen THAT fast. (No, there where no throing down, no overheating and so on)
Thanks for your time/answer!
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frostschutz
Advocate
Joined: 22 Feb 2005
Posts: 2977
Location: Germany
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| Posted: Sun Dec 17, 2006 11:48 pm Post subject: Re: crashed HDD, many badblocks |
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| huehnerhose wrote: | | After some tries I fínally got knoppix booting and run testdisk, writing a new partition table and so on. |
You're nuts.
| huehnerhose wrote: | | Any idea how rescue some data? |
If the data is really really important and absolutely needs to be rescued, give the hard disk to a data rescue center (and pay for not making backups).
If you want to see what you can do by yourself, make a raw copy of the disk, and don't touch it anymore (make your rescue experiments on another copy of the copy). Working directly on the already damaged hard disk with random read/write access may very well cause it to break completely.
You can make a copy using dd (with conv=noerror and sync options) or the dd_rescue variant of dd. Don't do write access on the disk, don't use rescue software like testdisk etc., in general don't use tools that were made to rescue data when parts of the disk were overwritten by accident. They are not for disks that are actually broken. Use those tools on the copy (which resides on a working disk) only.
| huehnerhose wrote: | | How could it happen that the HDD crashes that way during one simple reboot? |
Any HDD can die at any time. It does not matter wether the machine is currently running, booting, or doing nothing. Next thing you know it's dead and the data is gone. If you have data you don't want to use, make a backup, make sure there is more than just one copy of the data. |
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NeddySeagoon
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Joined: 05 Jul 2003
Posts: 54815
Location: 56N 3W
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| Posted: Sun Dec 17, 2006 11:49 pm Post subject: |
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huehnerhose,
Look at dd_rescue and dd_rhelp.
dd_rhelp is a wrapper for dd_rescue. Together the two do a binary search of your drive reading blocks that are easy to read first.
The program approaches bad sectors from both lower and higher tracks and uses more and more retries each pass.
Its only worth trying if you did not use the seagate DiscAnalyzing tool in its destructive mode, which overwrites your data.
The likely failure mode is a a platter bearing failed, so you data may be readable if you operate the drive in unusual positions, eg. upside down, on edge (try all four). You only need one good read of each block.
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Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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