I was trying to use Disk Utility program to edit some partition in my system. But I got a strange error message "invalid partition table on /dev/sda -- wrong signature 0." and couldn't proceed. So I tried with gparted(Gnome Partition Editor). The result wasn't any different. Today while clean installing Ubuntu 11.10 Oneiric Ocelot, the installer said that there was no partition in my disk. While trying live CD, I could find all the partition and read data. If you also encounter any of the above problem, simple run fdisk by sudo fdisk /dev/sda press p and then press w . You'll see a message "The partition table has been altered!". Now try running the partition editor or the installer again.
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