[Cialug] Tar file corruption

[Scott Yates]

Ouch.  Ya, Steve is good, but not THAT good.  lol

<bad_asian_tech_support_joke>"You have baaaaa
hawea"</bad_asian_tech_support_joke>



On Tue, Apr 30, 2013 at 2:31 PM, David Bierce <david at bierce.org> wrote:

> Since I have a known good copy of the data I care about, it has become
> more of an exercise in repairing tar corruption than anything.
>
> Pretty sure HD repair tools won't work unless Mr. Gibson found a way to
> fixed bad actuators/arms.  Before it totally stopped worked...it was making
> clicking noises like it found some of Heisenberg's Blue Candy  :) .
>
>
> On Apr 30, 2013, at 2:22 PM, Scott Yates wrote:
>
> > One last thought.  If the drive is available to offline, you might try
> > spinrite, or other disk based recovery options to get a clean copy of the
> > archive.
> >
> >
> > On Tue, Apr 30, 2013 at 2:18 PM, Jeffrey Ollie <jeff at ocjtech.us> wrote:
> >
> >> On Tue, Apr 30, 2013 at 10:58 AM, David Bierce <david at bierce.org>
> wrote:
> >>> I have a tar file that was bzip2 compressed and had a few blocks to bad
> >> in media transfer, After pulling out the bad blocks, the reconstituted
> tar
> >> file appears to only function until the place in the file where the
> first
> >> block was corrupted.  After the first block it just doesn't read the
> rest
> >> of the data.  I've tried to read the file ignoring zero data, which just
> >> pulls a bunch of junk metadata and file names after the empty block.
>  I've
> >> tried to extract it using CPIO, which has the same problem after the
> empty
> >> block.
> >>>
> >>> Does anyone know of a tool that can repair tar files, or at least, try.
> >> Or it is time time to go digging deep into the file or give up :)
> >>
> >> The problem isn't the tar file, the problem is the bzip2 compression.
> >> bzip2 compresses things as a stream of blocks, with successive blocks
> >> being compressed dependin on what was in previous blocks, so if one or
> >> more blocks is corrupted, all subsequent blocks are corrupt.
> >>
> >> At least on linux, there's a bzip2recover program which might be able
> >> to recover some data, but you'll want to start with the original
> >> corrupted file, not the one you edited.
> >>
> >> --
> >> Jeff Ollie
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