TestDisk is a free partition recovery software that helps fix and recover lost/deleted system partitions and/or make non-bootable disks, bootable again. The application works under multiple Operating Systems such as DOS, Windows, Linux, Unix, Sun OS and Mac OSX.

Following are some of the main features of TestDisk:

*Fix partition table, recover deleted partition
*Recover FAT32 boot sector from its backup
*Rebuild FAT12/FAT16/FAT32 boot sector
*Fix FAT tables
*Rebuild NTFS boot sector
*Recover NTFS boot sector from its backup
*Fix MFT using MFT mirror
*Locate ext2/ext3 Backup SuperBlock

The following types of file systems/partitions are supported:

BeFS ( BeOS )
DOS/Windows FAT12, FAT16 and FAT32
HFS and HFS+, Hierarchical File System
Linux Ext2 and Ext3
Linux Raid (Raid 1,4,5 and 6)
Novell Storage Services NSS
NTFS ( Windows NT/2K/XP/2003/Vista )
Sun Solaris i386 disklabel
Unix File System UFS and UFS2 (Sun/BSD/…)

This is truly a great freeware software that can beat commercial applications hands down

Download a flavor of TestDisk for your OS type here