I am using WD Element 1TB portable hardisk and I must say its best in class. There was no issue with the detection of the harddisk in my both laptop and PC.
A must have hardisk and its very user friendly with respect to size and weight. I am very much satisfied after keeping my docs and pictures safely. WD also provide password protection and encryption. Though I havent used but I heard ita good. I bought this product online at a cost of ?4600/-. I will surely recommend for the hardisk for all your on the go data need.