Can't mount my hammer filesystem

Charles Rapenne charles.rapenne at
Mon Feb 21 00:28:55 PST 2011

Sorry, I has thought it was not possible to recover data, I've been
trying to remake a hammer FS on the disk with the same name and try to
recover it. Of course, it didn't work, but I had to try. Finally it
was a bad idea...

If you really want a disk image, I could try to reproduce this on a
smaller disk (actually it was a 500 Gb disk).
It'd be great if we could recover a hammer FS which has its volume
header corrupted/overwrited.

2011/2/21 Matthew Dillon <dillon at>:
> :
> :Thanks for your reply.
> :
> :I don't remember if I installed it on a disklabel or a slice. I will
> :be able to know what I did once I get the usb flash disk with the
> :system and look at the fstab.
> :
> :Hopefully, I didn't lose data because I did several backups before :-)
>    Ok, if the data is important we *can* recover it, so don't throw it
>    away, but it might require you making the whole image available to me.
>    I would need to add another option to the hammer recover directive to
>    supply the missing info (if the volume header is truly blown away) and
>    experiment a bit to figure out what the offset is in the image.
>    I've been meaning to add the option for a while now but that isn't the
>    real problem.  The real problem is that the volume header contains a
>    single piece of info, the data zone offset relative to the base of the
>    hammer filesystem, and it's a bit non-trivial to 'guess' it.
>                                                -Matt

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