TestDisk checks the partition and boot sectors of your disks. It is very useful in recovering lost partitions.
It works with :
DOS/Windows FAT12, FAT16 and FAT32NTFS ( Windows NT/2K/XP )Linux Ext2 and Ext3BeFS ( BeOS )BSD disklabel ( FreeBSD/OpenBSD/NetBSD )CramFS (Compressed File System)HFS and HFS+, Hierarchical File SystemJFS, IBM's Journaled File SystemLinux RaidLinux Swap (versions 1 and 2)LVM and LVM2, Linux Logical Volume ManagerNetware NSSReiserFS 3.5, 3.6 and 4Sun Solaris i386...