For any computer user, the most horrifying reality is the failure of his/her hard drive. Absence of a backup, spells doom for your data. If, while working on your computer, inadvertently the system stops responding and the green goes blank, and repeated booting provides no result, or displays innumerable error messages, then you know the data is certainly at the verge of loss, irrespective of whether, the system survives or not. You may receive messages indicating corruption of MBR (master boot records), malfunctioning of the OS (operating system), bad sectors, file system corruption, or something else. Whatever the case be, you have to give a try to the various file data recovery means...