In joining in with the silly season spirit I have managed to damage an
External 120GB Firewire Drive, by plugging in a 16V power brick
instead of it's usual 12V one.  (In my defence they do look
identical!)

With the proper 12V power brick plugged in, I get a red light warning
but I am unable to mount the drive on the iBook desktop.  When I
'hotplug' the firewire cable into the iBook the drives light changes
to purple/blue.

Any ideas on how I can determine if there is any data still on the
drive?  What is the likelihood of recovering any data after such a
power surge?

Any tips welcome.
Thanks,
Paul