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    SubjectRe: [PATCH] pdcraid and weird IDE geometry
    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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