[Cialug] Tar file corruption

[Scott Yates]

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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