Messages in this thread |  | | | Date | Thu, 17 Jul 2003 18:03:28 +0200 | | From | Andries Brouwer <> | | Subject | Re: [PATCH] pdcraid and weird IDE geometry |
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On Thu, Jul 17, 2003 at 11:34:11AM -0400, Jeff Garzik wrote:
> Can't you fix the geometry from fdisk expert mode? > > I've done that several times before, when otherwise like-sized disks > appeared with vastly different geometry.
It is easiest to think that it is meaningless what you say (in this case). A disk does not have a geometry, and moreover you cannot change it with fdisk.
However, under some circumstances, some kernels will guess a (translated) geometry from a DOS-type partition table, so it is true that under some kernel versions you can use fdisk to change the kernel's ideas about disk geometry. A very fragile activity.
[Moreover, there are several kinds of geometry, and the present authors of ide-disk.c conveniently confused them all. Concerning pdcraid, I don't know for which of the possible ideas of geometry it is true that one needs the first sector of the last cylinder.]
Andries
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