new hdd numeration after mainboard change

[Marco]

Thank you very much, of course it was the AHCI configuration in the
BIOS, luckily i can now switch between AHCI and compatibility mode when
using Windows(otherwise it will result in a bluescreen) ;-)

Best regards,
 Marco

Josh Paetzel wrote:
> Jeremy Chadwick wrote:
> > On Mon, Oct 13, 2008 at 07:12:20PM +0200, ilikefbsd at web.de wrote:
> >> i run "FreeBSD  7.1-PRERELEASE" i had a change of the mainboard of my
> >> lenovo notebook t60. after reboot the harddisk which was before
> >> recognized as "ad0" is now "ad4". i cannot find any other devices, no
> >> ad0/ad1/ad2 in /dev. even in the dmesg only ad4
> > The T60 is a laptop.  It only has one hard disk -- so I'm not sure why
> > you were seeing ad0, ad1, ad2 in the past.  You shouldn't have been,
> > unless you had 3 hard disks hooked up somehow.
>
> > The bottom line here is this: absolutely *nothing* requires the device
> > numbering to start at zero.  And this is definitely the case.
>
> >> does fbsd create a uniqe identifier for harddisks in combination with
> >> the motherboard or something like that?  where can i dig further into
> >> that issue?
> > It's not really an "issue".  Very likely your computer has toggled some
> > BIOS settings.
>
> > The T60 series has the ability to run the SATA ports in two modes: AHCI,
> > or Enhanced/Compatible.  Chances are before the motherboard swap, yours
> > was running in the opposite mode that it is now.
>
> > I would highly recommend using the AHCI mode.  It works quite well with
> > FreeBSD under Intel controllers.  Turn AHCI on (if it's not already),
> > and do not mess with it.
>
>
> I can verify as a T60 owner, if you toggle the BIOS between AHCI and
> "Compatability" the hard drive will show up as either ad4 or ad0.
>
> It works fine in either mode with FreeBSD.  Unless you are running
> another OS that doesn't have SATA support there's really no reason to
> use compatibility mode
>
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