TestDisk, an excellent free data recovery utility. TestDisk was primarily designed to help recover lost partitions and/or make non-booting disks bootable again when these symptoms are caused by faulty software, certain types of viruses or human error (such as accidentally erasing your Partition Table).
TestDisk is a free and useful program which queries the BIOS ( DOS/Win9x) or the OS ( Linux, FreeBSD) in order to find the Hard Disks and their characteristics ( LBA size and CHS geometry). TestDisk does a quick check of your disk´s structure and compares it with your Partition Table for entry errors. If the Partition Table has entry errors, TestDisk can repair them. If you have missing partitions or a completely empty Partition Table, TestDisk can search for partitions and create a new Table or even a new MBR if necessary.
TestDisk has features for both novices and experts. For those who know little or nothing about data recovery techniques, the command line parameters /log and /debug can be used to collect detailed information about a non-booting drive which can then be sent to a tech for further analysis. Those more familiar with such procedures should find TestDisk a handy tool in performing onsite recovery.
TestDisk can find lost partitions for all of these file systems:
* BeFS ( BeOS )
* BSD disklabel ( FreeBSD/OpenBSD/NetBSD )
* CramFS, Compressed File System
* DOS/Windows FAT12, FAT16 and FAT32
* HFS and HFS+, Hierarchical File System
* JFS, IBM´s Journaled File System
* Linux Ext2 and Ext3
* Linux Raid
o RAID 1: mirroring
o RAID 4: striped array with parity device
o RAID 5: striped array with distributed parity information
o RAID 6: striped array with distributed dual redundancy information
* Linux Swap (versions 1 and 2)
* LVM and LVM2, Linux Logical Volume Manager
* Mac partition map
* Novell Storage Services NSS
* NTFS ( Windows NT/2K/XP/2003 )
* ReiserFS 3.5, 3.6 and 4
* Sun Solaris i386 disklabel
* Unix File System UFS and UFS2 (Sun/BSD/...)
* XFS, SGI´s Journaled File System
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