~$ sudo fdisk -l

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


Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x4ecc625d

Device Boot Start End Blocks Id System
/dev/sda1 1 1953525167 976762583+ ee GPT
Partition 1 does not start on physical sector boundary.

Disk /dev/sdb: 31.4 GB, 31440502784 bytes
64 heads, 32 sectors/track, 29984 cylinders, total 61407232 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: 0x73696d20

This doesn't look like a partition table
Probably you selected the wrong device.

Device Boot Start End Blocks Id System
/dev/sdb1 ? 1919230059 6204919772 2142844857 a OS/2 Boot Manager
/dev/sdb2 ? 544829025 1089655755 272413365+ 65 Novell Netware 386
/dev/sdb3 ? 168653938 168653938 0 65 Novell Netware 386
/dev/sdb4 2885681152 2885734080 26464+ 0 Empty

Partition table entries are not in disk order