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Re: [Bug-ddrescue] how big should my MBR rescue be?

From: Ian Simmons
Subject: Re: [Bug-ddrescue] how big should my MBR rescue be?
Date: Sat, 26 Jul 2008 13:52:48 -0400

So far, no errors are reported and the image is up to 8 Gigs. I've had
to stop and restart several times over the past few days and at one
point I somehow overwrote the log file with one that had less data
retrieved from an earlier practice run. 

Initial status (read from logfile)
rescued:     7759 MB,  errsize:       0 B,  errors:       0
Current status
rescued:     8634 MB,  errsize:       0 B,  current rate:     131 kB/s
   ipos:     8634 MB,   errors:       0,    average rate:     132 kB/s
   opos:     8634 MB
Copying data...

I made a copy of the image when it was only 4 Gigs and used it to learn
how to use photorec. It retrieved several mp3s that will not play. I am
assuming this is because the mp3s were fragmented across the drive so
when I retrieved them it didn't have the complete files. Is this a
correct assumption that I will need to try again on the complete image
after ddrescue it finished? Is there a way to tell when all the actual
data is rescued and stop it so it isn't just rescuing empty sectors?

Thanks for the help. I will go and read the web pages you suggested.

On Sat, 2008-07-26 at 09:19 -0700, andrew zajac wrote:
> --- On Sat, 7/26/08, Ian Simmons <address@hidden> wrote:
>         From: Ian Simmons <address@hidden>
>         Subject: Re: [Bug-ddrescue] how big should my MBR rescue be?
>         To: "James Bardin" <address@hidden>
>         Cc: "ddrescueQuestions" <address@hidden>
>         Received: Saturday, July 26, 2008, 12:09 AM
>         Does this mean the file system is corrupted and needs to be restored 
> in
>         the image? How do I go about getting the image to a state where I can
>         mount it to get the files from it? Will the linux file recovery tools
>         mentioned such as photorec/testdisk fix the ntfs of the image?
> How much of the image contains errors?
> You are able to work on the image (or a
>  copy of the image, since trying to fix a broken filesystem may result in 
> further data loss) using linux.  It's easier than working on another drive, 
> actually.
> You may be able to repair the ntfs filesystem, but if you can't, you can use 
> file-carving software like photorec or foremost.  
> You can get more details here:
> https://help.ubuntu.com/community/DataRecovery
> You can also try fixing the NTFS boot sector.  Again, you don't need to write 
> the image back a a hard drive to do this.
> http://ubuntu-rescue-remix.org/node/57
> Good Luck.
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