10/16   I just upgraded my kernel to 4.7 and now it can't find the root
        partition.  I took out the ata static id option, so what should
        my root partition be called now?  It used to be /dev/ad1s1a.
        Even when I try to specify the name with ufs:/dev/... it says
        "can't find device ad"
        \_ Why would you start changing options before you've seen it come
           up clean?  Toss in a recovery floppy or the 4.7 boot cd and try to
           recover from there.  I did a fresh 4.7 install last night and it
           went fine.  I didn't change anything low level though.
        \_ only your kernel? did you upgrade the world too?