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.
Currently supported (guessable) filesystem or partition types:
* BeOS filesystem type.
* BtrFS filesystem type.
* FreeBSD/NetBSD/386BSD disklabel sub-partitioning scheme used on Intel
* Linux second extended filesystem (Ext2).
* MS-DOS FAT12, FAT16 and FAT32 "filesystems".
* IBM OS/2 High Performance filesystem.
* Linux LVM and LVM2 physical volumes.
* 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 journaled filesystem for Linux.
Gpart is useful in recovery actions and forensics investigations.