How could I recover my drive from RAW?

I installed Ubuntu to a 60GB external hard drive i have (EXT4). Ubuntu installed fine and i was able to boot into it.
When I went to access my data drive Gbut nothing was there. To my utter horror, the drive has been replaced with a RAW file system, attempting to access the drive brings an error about not being able to access the drive due to an unknown file system.
Is the drive now completely wiped or do I have a chance to recovery? I have around 200GB important data on there and I cannot afford professional data recovery. What could I do?