i having some ploblem about ATA resetting? please help me?

[Kitisak]

Hi,

        I purchased a Computer Server and plan to install freebsd 4.9 =
os.
but I have some ploblem with booting messages such as:
-----------------------------------------------------------------------
ad0: READ command timeout tag=3D0 serv=3D0 - resetting
ata0: resetting devices .. ata0-slave: ATA identify retries exceeded
done
ad0: READ command timeout tag=3D0 serv=3D0 - resetting
ata0: resetting devices .. ata0-slave: ATA identify retries exceeded
done
ad0: READ command timeout tag=3D0 serv=3D0 - resetting
ata0: resetting devices .. ata0-slave: ATA identify retries exceeded
done
ad0: READ command timeout tag=3D0 serv=3D0 - resetting
ad0: timeout waiting for cmd=3Def s=3Dd0 e=3D00
ad0: trying fallback to PIO mode
ata0: resetting devices .. ata0-slave: ATA identify retries exceeded
done
ad0: READ command timeout tag=3D0 serv=3D0 - resetting
ata0: resetting devices .. ata0-slave: ATA identify retries exceeded
done
ad0: READ command timeout tag=3D0 serv=3D0 - resetting
ata0: resetting devices .. ata0-slave: ATA identify retries exceeded
done
ad0: READ command timeout tag=3D0 serv=3D0 - resetting
ata0: resetting devices .. done
ad0: READ command timeout tag=3D0 serv=3D0 - resetting
ata0: resetting devices .. ata0-slave: ATA identify retries exceeded
done
-------------------------------------------------------------------------=
--------------------------------------------------------

Please help me too.
Thank you very much.

C.Kitisak