Ubuntu 12.10 does not detect my internal hard disk

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http://askubuntu.com – I installed ubuntu 12.10 on my computer. I don't know where I went wrong but after the installation, I get an error that says "unable to mount location" when I try to access my hard disk. I ran "sudo fdisk -l" in the terminal and found the following result. Can somebody help me out? Thanks. Disk /dev/sda: 320.1 GB, 320072933376 bytes 255 heads, 63 sectors/track, 38913 cylinders, total 625142448 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00057320 Device Boot Star (HowTos)