Data recovery is the process of recovering data from failed, damaged, corrupted, inaccessible secondary storage media when it cannot be accessed normal way. Often the data are being recover from storage media formats such as CDs, hard disk drives, storage tapes, DVDs, and other electronics. Recovery may be required due to physical damage to the storage devices or logical damage to the file system that prevents it from being mounted by the host operating systems. Although there are some confusions as to the term, data recovery can also be the process of retrieving and securing deleted information from a storage devices for forensic purposes or spying.