A disk image is a file which consists of files in different formats. It is usually stored with an .iso extension. The disk image consists of all the contents of the storage device, copied sector by sector onto the file, along with the structure of the storage device, whose image is being created. Disk images can be compressed to save space. A compressed disk image saves room by using an algorithm that amounts to digital shorthand.
Taking a disk image has many advantages over the regular backup. In a regular backup, the data has to be saved onto the appropriate partition manually. If you use the regular backup, the drives have to be manually partitioned and formatted, and the operating system installed and configured. Then, the programs have to be reinstalled and reconfigured, followed by restoration of data files from backups. A disk image can take care of all of these time-consuming steps with a single, easy command. Disk images can also be used in recovering lost data from hard drives.
You can obtain a disk image using a good. REMO Recover (Windows) Pro Edition software lets you take the disk image of a given drive, and later helps you in recovering lost data from the created disk image. The software also lets you recover data from lost/deleted partitions with ease.