Stu,
Visit the Western Digital site
http://support.wdc.com/product/downl...vel1=6&lang=en
and locate your product. Here you can download some data diagnostic software from WD.
The diagnostic will tell you if the drive can be read. If not you have the option of recovering the data via specialist company. A mate of mine had the very same problem in January and it cost more than $1000 but he did get all his data back. If you can do wothout the data and if the drive is less than 3 years old they'll replace it essentially for the cost of the shipping to Singapore but first you need a Warranty-RMA number. It takes about three weeks from the time you return your drive until the replacement arrives. The good thing about the replacement is that it comes with another three years warranty. The bad thing is that you loose your data.