Re: Review/Test: Pseudo-device unit number management patch

From: Andre Guibert de Bruet (andy_at_siliconlandmark.com)
Date: 02/19/04

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    Date: Thu, 19 Feb 2004 03:09:31 -0500 (EST)
To: "M. Warner Losh" <imp@bsdimp.com>

    On Wed, 18 Feb 2004, M. Warner Losh wrote:

    > In message: <39796.1077013415@critter.freebsd.dk>
    > "Poul-Henning Kamp" <phk@phk.freebsd.dk> writes:
    > : Current our handing is that if it disappears, it's gone, if it comes
    > : back it's probably a new one anyway.
    >
    > Yes. If the hardware goes away and comes back, it can be very
    > difficult to know if you have the same hardware or different
    > hardware. This is less true of network cards, but definitely true of
    > CF cards (which can easily be identical from inspection, but have
    > different contents).

    The likes of ATA disks include serial numbers in words 10-19. These could
    be used to positively identify a drive when its availability has come
    into question. From what I recall, CF cards use an ATA-like command set.
    Wouldn't it be possible to get the serial number and model from them for
    positive identification?

    Regards,
    Andy

    > Andre Guibert de Bruet | Enterprise Software Consultant >
    > Silicon Landmark, LLC. | http://siliconlandmark.com/ >
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