Friends, I am using the disk from a long time but last night I heard a sound and didnít paid attention on that and continued to using that. It increases the noise and so I rebooted the system. But it was not able to boot the system. I am afraid that the data may be lost or deleted from this as it normally happens in such cases. So you all have any ideas that how I can do that then please tell me that. It will be rally a great help from you people. Thank you.