Re: [Gumstix-users] Extra partition with new SD card instructions

[Don Q. de la M. <qu...@du...>]

On Tue, Oct 4, 2011 at 7:28 PM, Ash Charles <ash...@gm...> wrote:
> Hmm---I also see sfdisk allocating any leftover bits to a third
> partition.  I can't figure out how to prevent this behaviour from the
> sfdisk command line.  In a script, I get the correct behaviour if I
> just specify two partitions.  Any one have an idea?

I'm pretty sure Master Boot Record partition tables always have a
total of four primary and extended partitions.  That's because there
is a fixed-sized array in the boot sector that is four slots long.

I think you could remove the unwanted sector by zeroing out the
contents of the third partition slot.  It might not be hard to patch
the sfdisk source to do that, or you could do it with a hex editor if
you look up the byte offset of the partition table in the MBR.


-- 
Don Quixote de la Mancha
Dulcinea Technologies Corporation
Software of Elegance and Beauty
http://www.dulcineatech.com
qu...@du...