Seagate is updating their FreeAgent GoFlex Slim Portable HDD product line with a new series with larger capacity. Previously, we have seen how awesome this portable HDD is. The 320GB was coming with USB 3.0 interface and the HDD is very slim. In this new series, It’s coming with all the same features that the previous 320GB have. The only different is the size, which is larger at 500GB. It also sporting USB 3.0 interface, 7200RPM spindle speed and will hit the retailer stores for US$169.