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SubjectRe: Blockbusting news, results are in
On Tue, 21 Oct 2003 Valdis.Kletnieks@vt.edu wrote:

> On Tue, 21 Oct 2003 16:05:15 EDT, "Richard B. Johnson" said:
>
> > If the respondent wants them isolated into a "BADBLOCKS" file,
> > he can make a utility to do that. It's really quite easy because
> > you can raw-read disks under Linux, plus there is already
> > the `badblocks` program that will locate them.
>
> Yes, it's trivially easy to figure out that block 193453 on /dev/hdb is bad.
> It's even not too bad to map that to an offset on /dev/hdb4. Even if you're
> using LVM or DM to map stuff, it's still attackable. But how do you guarantee
> that block 193453 gets allocated to your badblocks file and not to some other
> file that just tried to extend itself by 32K?
>
>

You repair file-systems when they are not mounted. Also, the
source of an old version of e2fsprogs has a "defrag" utility
that could be used as a sample of how to create a file that
owns the bad blocks you find.

Cheers,
Dick Johnson
Penguin : Linux version 2.4.22 on an i686 machine (797.90 BogoMips).
Note 96.31% of all statistics are fiction.


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