I got shafted by a fraudster

I got hoodwinked in this format I bought and paid for a 2gb and low and behold after storeing 400mb the drive was full, talk about feeling gutted the buyer who I bought the item from was based in china seller name was C2C-megastore so please be weary when buying items such as this, Q what precautuions can you take A as soon as you get one fill it up to its max with data and if it works then fine if not get in touch with ebay sharpish. I someone learns from my mistake, take it easy ya all :-)