Subject: Re: bin/21027: fdisk is missing an option to avoid displaying extended partition data
To: David Laight <>
From: Manuel Bouyer <>
List: netbsd-bugs
Date: 04/06/2003 20:48:10
On Sun, Apr 06, 2003 at 03:48:11PM +0100, David Laight wrote:
> Multiple extended partitions are illegal.  Although each extended

You mean, multiple extended partitions in the MBR ?

> partition appears to allow for 4 partitions, it is only allowed to
> contain a single normal partition and a further extended one.
> In a validly formatted extended partition each partition starts on
> a cylinder boundary and has the first track reserved to contain
> (in its first sector) the details of that partition and the location
> of the next one.  These are always linked in increasing sector number
> order.
> Clearly there is a massive scope for incorrectly formatted extended
> partitions - but none of the standard fdisk utilities should let
> you generate them.

Sure, but it should allow to read them. I'm almost sure I already seen theses

Manuel Bouyer <>
     NetBSD: 24 ans d'experience feront toujours la difference