external hardrive problem

I have a la cie ext. hard drive that I have been using for about 5 months, today I plugged it in and have a message saying... .the disc you inserted is not readable by this computer. I have buttons saying initialize ignore and eject.
I have to take some self contained movie files to a post house tomorrow and don't know how to make the " no name" insignia appear. The only difference in procedure from my previous usage of this HD is that there is no data on the drive... in the past I have used it to transfer video P2 data from camera to computer.

Can anybody help??. I don't know much about computers, just how to make movies in Final Cut.
Catherine Bennett