sudo gdisk -l /dev/sdc
GPT fdisk (gdisk) version 0.8.1

Caution: invalid backup GPT header, but valid main header; regenerating
backup header from main header.

Warning! Main and backup partition tables differ! Use the 'c' and 'e' options
on the recovery & transformation menu to examine the two tables.

Warning! One or more CRCs don't match. You should repair the disk!

Partition table scan:
  MBR: protective
  BSD: not present
  APM: not present
  GPT: damaged

****************************************************************************
Caution: Found protective or hybrid MBR and corrupt GPT. Using GPT, but disk
verification and recovery are STRONGLY recommended.
****************************************************************************

Warning! Secondary partition table overlaps the last partition by
4294966385 blocks!
You will need to delete this partition or resize it in another utility.
Disk /dev/sdc: 1565565872 sectors, 746.5 GiB
Logical sector size: 512 bytes
Disk identifier (GUID): C3326FFA-5472-4CE9-8725-1D4769FCBE0F
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 1565565838
Partitions will be aligned on 2048-sector boundaries
Total free space is 2014 sectors (1007.0 KiB)

Number  Start (sector)    End (sector)  Size       Code  Name
   1            2048      5860532223   2.7 TiB     0700  Basic data partition

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sudo fdisk -l /dev/sdc

WARNING: GPT (GUID Partition Table) detected on '/dev/sdc'! The util fdisk doesn't support GPT. Use GNU Parted.


Disk /dev/sdc: 801.6 GB, 801569726464 bytes
256 heads, 63 sectors/track, 97071 cylinders, total 1565565872 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xc8014eb6

   Device Boot      Start         End      Blocks   Id  System
/dev/sdc1               1  4294967295  2147483647+  ee  GPT