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Old 08-19-2008, 06:57 AM   #1
Bharat Kumar pankaj
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How to recover overwrite 35 GB data


Hi


I am using SunOS .5.8

How to recover overwrite 35 GB data in linked file.

bcs i did mistck on tar cmd extrat.
 
Old 08-19-2008, 08:01 AM   #2
GlennsPref
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Hi, you should be able to recover all of your data.

photorec and testdisk tools are available for linux and windows and on some system-rescue live cdroms.

There's a bit of reading involved and you'll need a partition of equal or larger size to finish the job.

Another program is dd_rhelp, A very good program for data recovery.

Regards, Glenn
 
Old 08-22-2008, 02:41 AM   #3
Rowley
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Quote:
Originally Posted by GlennsPref View Post
Hi, you should be able to recover all of your data.
Wow...that's a confident statement! I wish I were as optimistic as you!
I would say he might be able to recover his data with some kind of DR tool providing the OS hasn't crapped all over the data with something else.
He should have probably pulled the plug the instant he realised that you ballsed-up, that there's no decent backups and you're only option might be some recovery tool.

One would hope one's backups are in good order.

Good luck.
 
Old 08-22-2008, 02:55 AM   #4
GlennsPref
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Quite right, backup is the best option, and yes, perhaps too confident,

but dd_rhelp (I think)can pull files by date selection,

It takes ages and you need a spare partition to copy the 35gig to.

The documentation is quite good, I encourage everyone to have a read.

Cheers, Glenn

ps, I've just been reading about trinity rescue cd...

http://trinityhome.org/Home/index.ph...=5&front_id=12
 
Old 08-24-2008, 05:31 AM   #5
unSpawn
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Quote:
Originally Posted by Rowley View Post
Wow...that's a confident statement! I wish I were as optimistic as you!
Exactly my first thoughts.

Tools like dcfldd, ddrescue, dd_rescue, rdd-copy (find most of them on the HELIX Live CD) which features I described in short here, are tools used to get the data off the disk as much intact as possible (investigators would call that the acquisition phase), not for recovery in the sense of "undeleting". There's lots of threads at LQ about "undeleting" based on header / footer carving with tools like Photorec, Foremost, scalpel or other forensic tools. See for instance here, here and here. Because every situation is unique (read-writes between acquisition and recovery, journalling, on-disk filesystem structure leftovers, HW probs), I would always be careful and say no tool comes with a guarantee for recovery.
 
Old 08-24-2008, 09:11 AM   #6
GlennsPref
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I may be confident, but, dd_rhelp man page says it may recover by date, and I believe it.

Cheers, Glenn


And maybe I was, try it.

edit
I also think that the links shown hold there own.

No wonder it costs so much to get someone to do it for you.

Last edited by GlennsPref; 08-24-2008 at 09:22 AM. Reason: it costs so much to get someone to do ity for you
 
Old 08-24-2008, 11:20 AM   #7
jlliagre
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My understanding is dd_rhelp is meant to overcome bad disk sectors so has nothing to do with what the OP is looking for (file recovery).

Moreover, the OP wrote the file has been overwritten which likely mean, given the size involved (35 GB) the file data has been overwritten too. That will defeat all techniques the remaining tools mentioned are about.

I'm more than pessimistic about that case ...
 
  


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