about changing a new harddisk

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Dear,

I have just upgrading my BSD machine from my old 440BX motherboard with
Promise ATA Chipset to a new VIA Chipset montherboard for AMD.  I have
sucessfully mount the root partition.  However, I cannot mount the /usr and
/var,  I try all of the slice in ad0(there are 4 slice in the drive),
Actually, What should I do for it.  I want to try to mount the /usr to use
ee to re-write the /etc/fstab.  But, I cannot access the ee while /usr has
not been mounted.

Do anyone know what should I do now?

KEN