hard drive unformated it self !?

[MaKoMaN]

I defragmented my harddrive last night, and when I booted my pc it suddenly said it was not formated
I am 100% I did not format it.
I have 3 hard drives at the moment:
- 74GB Raptor for Windows and programs
- 36GB Raptor for my music & video editing software
- 250GB Maxtor Maxlineplus II (I think thats is the model) where I put all my movies,

The maxtor drive is the one that unformated it self, in diskmanager it says it is "raw", it does not show up in the defragmenter screen.

pc specs if it helps:
Window XP pro SP2
p4 3.0
1GB ddr-ram
an MSI 875-pe motherboard
leadtek 6800GT
a plextor dvd±rw

is it possible to somehow recover my files? (i had about 200gb worth of files when this happened )

i cant imagine getting all those files again.

please advise me on what to do.

thanks in advance for your help.