Gpart is a tool which tries to guess the primary partition table of a PC-type disk in case the primary partition table in sector 0 is damaged, incorrect or deleted. It is also good at finding and listing the types, locations, and sizes of inadvertently-deleted partitions, both primary and logical. It gives you the information you need to manually re-create them (using fdisk, cfdisk, sfdisk, etc.). The guessed table can also be written to a file or (if you firmly believe the guessed table is entirely correct) directly to a disk device. Supported (guessable) filesystem or partition types:

• BeOS filesystem type.
• FreeBSD/NetBSD/386BSD disklabel sub-partitioning scheme used on Intel platforms.
• Linux second extended filesystem.
• MS-DOS FAT12/16/32 “filesystems”.
• IBM OS/2 High Performance filesystem.
• Linux LVM physical volumes (LVM by Heinz Mauelshagen).
• Linux swap partitions (versions 0 and 1).
• The Minix operating system filesystem type.
• MS Windows NT/2000 filesystem.
• QNX 4.x filesystem.
• The Reiser filesystem (version 3.5.X, X > 11).
• Sun Solaris on Intel platforms uses a sub-partitioning scheme on PC hard disks similar to the BSD disklabels.
• Silicon Graphics’ journalling filesystem for Linux.

To run a full scan of your file system: gpart -v -f <file system>