If we are using a windows based system then we generally divide the hard drive into several partition. The primary partition is used for loading operating system. The other logical partitions are used to store data. The benefit of dividing the hard drive into various partitions is that if anything goes wrong with the operating system then it does not affect our data. Sometimes it happens that operating system does not boot up either because of NTLDR goes missing or Boot.ini got corrupted. To repair the operating system we use Restore CD. The restore CD load the operating system again by formatting the partition of the drive. Thus we loose all the data on that partition of the drive. It may also happen that our hard drive crashes and we reload the operating system only finding that other partition of the drive is not accessible. To recover the lost partition we require good data recovery software. Partition recovery process is a significant part of data recovery. Partition recovery utility helps in recovering lost partition from accidental partition format, partition lost due to viruses, or partition becoming inaccessible. Partition recovery utility provides recovery from FAT 16, FAT32 vFAT, NTFS & NTFS5 file system. There are number of partition recovery utilities but what I used which search certain text within deleted files and is quite powerful. It can recover files from severely corrupted drive. Can recover re-partitioned hard drive (even after file system has been changed) Partition recovery software should also be able to recover corrupt master boot record. The master boot record (MBR) is located on the first sector of the hard drive and is responsible for starting the Windows boot procedure. MBR contains the partition table for the drive as well as a small program called the master boot code, which is responsible for locating the active, or bootable, partition, in the partition table. Once this occurs, the partition boot sector takes over and begins loading Windows. If the master boot record is corrupt, the partition boot sector can't do its job and Windows won't boot.Stellar Phoenix Windows Data Recovery Software is a file and partition recovery utility which helps us to recover the lost partition from formatted, erased or lost partition due to accidental format, viruses, software malfunction or even sabotage. It provides partition recovery from FAT 16, FAT 32, vFAT, NTFS & NTFS5 file system. Stellar Phoenix supports partition recovery from Windows XP, Windows 2000, Windows 98 and older operating system hard drives.