Hi there Leo72,
That's really bad.
Most probably the drive got physically damaged. So, it is possible that you will not even be able to format it(you shouldn't format it for now as it can be data destructive).
Apart from that, you can go to Disk Management and see how is the drive recognized over there. Does it have partitions and/or file system?
I guess you can use some partition/data recovery tool and try to access the drive.
In case the data on the drive is really important, I would say that you will need to contact a data recovery company.
You can check WD's Data Recovery Partners out:
http://products.wdc.com/support/kb.ashx?id=SHjaQ4
Hope this will help,
D_Know_WD