can i add another hard drive to my computer and which one should i get?

computer specs: General * Type Personal computer * Recommended Use Home use * Product Form Factor Tower * Built-in Devices LED panel, Keyboard * Localization English / United States Processor * Type Intel Pentium E5200 / 2.5 GHz * Multi-Core Technology Dual-Core * 64-bit Computing Yes * Installed Qty 1.0 * Max Supported Qty 1.0 [...] http://bit.ly/iH3BO2