need help repairing this system... mount issues

[Bsd Neophyte]

a previous system failed, as a result, i was forced to move the HD to a
new system.  unfortuantely, the systems are quite different.  the last one
was a full integrated cel633 and the new system is a dual p3700 with all
individualized components.

after a great deal of effort, was finally able to get my system to boot
the root partition.  i changed the type of kernel being booted to
kernel.GENERIC and i had to really struggle to find out the new disk
labels.

well i found that now the disk was no longer da0 but da4.  so i had to
boot by entering "ufs:/dev/ad4s1a" 

i am able to boot, but i'm having some issues now.

i've tried "mount /dev/ad4s1e /usr" but this wont work.  i get the
following error: "mount: /dev/ad4s1a: No such file or directory"

i decided to look under /dev, for some reason under the disk pointers (is
that what they are called?) only go up to da3, there is no mention of da4.
 i really don't know what to do to mount /usr.

i know i can do a reinstall, but i don't want to do that.  i have some
items on it that haven't been backed-up yet that i can't afford to lose.

if someone can tell me how i can get this thing back and running, i would
really be appreciative.

thanks...

 

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