I bought a new laptop of 64 bit Toshiba 4th gen. I use dual boot system (Win8 pro and Ubuntu 13.04 64 bit). When I use Ubuntu then I found my hard drives (D:, E:, F:) showing a special sign like ?. I can't access those drives. When I click on them it tells me to mount. But I haven't a clear idea how to mount a hard drive. I already tried to mount by the help of internet but I failed to do so. How can I access those drives? Do I need to install any software/ application? Please give me a quick response.