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

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

# sfdisk -l /dev/sdb

WARNING: GPT (GUID Partition Table) detected on '/dev/sdb'! The util fdisk doesn't 

support GPT. Use GNU Parted.

Disk /dev/sdb: 27960.2 GB, 27960226611200 bytes
255 heads, 63 sectors/track, 3399303 cylinders, total 54609817600 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: 0xe907e907

Solution :

#fdisk -l /dev/sdb

- To create a partition start GNU parted as follows:

# parted /dev/sdb

Output:

GNU Parted 2.3
Using /dev/sdb
Welcome to GNU Parted! Type 'help' to view a list of commands.
(parted)

- Creates a new GPT disklabel i.e. partition table:

(parted) mklabel gpt

Sample outputs:

Warning: The existing disk label on /dev/sdb will be destroyed and all data on this disk 

will be lost. Do you want to continue?
Yes/No? yes
(parted)

- Next, set the default unit to TB, enter:

(parted) unit TB

- To create a 3TB partition size, enter:

(parted) mkpart primary 0 0

OR

(parted) mkpart primary 0.00TB 3.00TB

- To print the current partitions, enter:

(parted) print

Still you get this WARNING then use this commands:

dd if=/dev/urandom of=/dev/sdb bs=512 count=64
or
dd if=/dev/zero of=/dev/sdb bs=1024

Done