$ sudo sgdisk --print /dev/sdb
Caution: invalid main GPT header, but valid backup; regenerating main header
from backup!

Caution! After loading partitions, the CRC doesn't check out!
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!

****************************************************************************
Caution: Found protective or hybrid MBR and corrupt GPT. Using GPT, but disk
verification and recovery are STRONGLY recommended.
****************************************************************************
Disk /dev/sdb: 976773168 sectors, 465.8 GiB
Logical sector size: 512 bytes
Disk identifier (GUID): 27E5BAAF-6A2D-11E5-B196-806E6F6E6963
Partition table holds up to 1 entries
First usable sector is 2, last usable sector is 976773166
Partitions will be aligned on 2048-sector boundaries
Total free space is 976773165 sectors (465.8 GiB)

Number  Start (sector)    End (sector)  Size       Code  Name