I bought the cable to link an external drive WD 1TB My Book Home Edition to my laptop (using a 2 port eSata cardbus adapter already installed) but after connecting the external drive, the computer would not recognize the external drive.
I read other reviews to this product and after trimming with a knife, 1 mm of the plug's outter casing to expose more of the metal, it worked fine.
It's great for the price, but not so good if you don't like DIY jobs :)