new hdd numeration after mainboard change

[ilikefbsd at web.de]

Hello list,

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. 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?

thank you,
 marco
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