Power Supply possibly blew up

I had bought the WD My Book Essential 500 GB Ext Hard Drive from USA. When I tried using it in UK, I had chosen a 18V power supply by mistake where as the Drive works at 12 V. Within seconds when I found plastic burning smell - I stopped the supply. Later when I tried with the right 12 V supplied adaptor using a covertor plug (US to UK) the hard drive would not start up and the Laptop would not recognise the drive. Is there a way, where I can fix this problem. Since it is a brand new equipment - its sad to see I lost it before I could use this.... please suggest if this is repairable.