What is the biggest hard drive that I can buy for a xbox360?

I'm not talking about the 250GB($130) replacement from microsoft but one that I can get like this one; http://www.newegg.com/Product/Product.aspx?Item=N82E16822136387&nm_mc=AFC-C8Junction&cm_mmc=AFC-C8Junction-_-na-_-na-_-na&AID=10446076&PID=361116&SID=FW9cdf4b I know I will need to do the xbox360 firmware hack for it to work, but I wondering if that is the biggest I can get or if I can get one with a larger capacity to work with the hack? All I keep seeing is that 250GB one is the biggest people are using with the hack. Thanks.