Re: Libvolume incorrectly detects FAT32

[Kay Sievers <kay.sievers@vrfy.org>]

On Mon, Mar 06, 2006 at 10:59:31PM +0100, Michael Buesch wrote:
> On Monday 06 March 2006 21:57, iSteve wrote:
> > Hello,
> > I'm having one silly partition, which has remnants of previous FAT32 filesystem
> > on it, a LILO bootloader on it and ext2 filesystem spaning all over the
> > partition.
> > 
> > The first 512B look exactly like a valid FAT partition header would, except the
> > magic is "LILO". 
> > 
> > I've looked at the sources for FAT detection, and I noted that when a FAT-like
> > filesystem misses magic, it's still considered valid, since as comment says,
> > some old floppies may lack it. I consider this point valid, however, this
> > causes my partition to be detected, incorrectly, as FAT32.
> > 
> > My proposed solution is to compare magic if FAT32 is assumed, and if magic will
> > not match for FAT32, consider it a failure; floppies that old that they lack
> > any magic will most likely not be formatted in FAT32.
> > 
> > Trivial patch is attached, comments/complaints?:)
> 
> Yes, I fear users of stupid digicams may get hit by this.
> The Formating option on cheap digicams may sometimes be buggy implemented.
> I think you should instead do a
> dd if=/dev/zero of=/dev/partition bsQ2 count=1
> and reformat your partition.

Yes, just use a sane formatting program like everything which is
libparted based. The usual Linux commandline formatters are horribly
broken and I gave up to talk to the ignorant maintainers. Just zero-out
the device at the beginning _and_ the end of the device if you reformat it
with a new filesystem type. Or use a libparted or similar based program.

Thanks,
Kay


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