Your ThinkPad notebook has become a vital part of your success. But as you add applications and data you might need to add more storage capability to handle the load. Increase your hard drive capacity with a larger primary system hard drive for ThinkPad X30, T, R, A and G Series notebooks or add a second HDD to the system via the Ultrabay 2000 in the T20/30, R30/40 and A Series ThinkPad Dock II and UltraBase X3/X4 media slice. Or, for use with the 2nd HDD Adapter for Ultrabay Slim in the T40 and R50 Series and the X4 Ultrabase Dock.