In last month, my friend nick got in trouble when he founds his hard disk fails to read any data from disk. Absolutely, it was a problem of data corruption in his hard drive. I had suggested him to go computer vendor where he had buy that computer & repair the hard drive. Then, there was only one way to recover its data from hard disk. And that is what data recovery software, which is the most integral application in such critical situation. Data recovery essentially means the procedure of acquire back usable data from the damaged, corrupt media or storage device. The loss of important data can cause fall down of businesses, leaving you and your company in the most vice situation to face. Recovering data from physically damaged hardware can involve various techniques. Some damage can be repair by replacing part in the hard disk. This alone may make the disk usable, but there may still be logical damage. A specialized disk imaging procedure is used to recover every readable bit from the surface. Once this image is acquired and saved on a reliable medium, the image can be safely analyzed for logical damage and will possibly allow for much of the original file system to be reconstructed. Data recovery is the process of salvaging data from damaged, failed, corrupted, or inaccessible secondary storage media when it cannot be accessed normally. Often the data are being salvaged from storage media formats such as hard disk drives, storage tapes, CDs, DVDs, RAID, and other electronics. Recovery may be required due to physical damage to the storage device or logical damage to the file system that prevents it from being mounted by the host operating system. Although there is some confusion as to the term, data recovery can also be the process of retrieving and securing deleted information from a storage media for forensic purposes or spying. Two general techniques used to recover data from logical damage are consistency checking and data carving. While most logical damage can be either repaired or worked around using these two techniques, data recovery software can never guarantee that no data loss will occur. For instance, in the FAT file system, when two files claim to share the same allocation unit (cross linked), data loss for one of the files is essentially guaranteed. Nowadays, data recovery becoming an integral part of large enterprises, small businesses and also has various important applications in information technology industry to build up disaster management system for their domain computers.