I've used Seagate FreeAgent Pro 500 Gb. It has been divided into 2 partitions. one is used for time machine, another is used for keeping my important data. I think that the Finder should show both partitions on the left, but it shows only Time machine . I regularly run software update. As I can remember, it has ever shown two partitions. I don't know whether this is related to software updating or not. If it is 'yes', how can I solve it? Thanks!