This is because you must use parted instead of fdisk to format the drive.
parted /dev/sdta
(parted) mklabel gpt
mklabel gpt
Warning: The existing disk label on /dev/sdta will be destroyed and all data on
this disk will be lost. Do you want to continue?
Yes/No? yes
yes
(parted) mkpart primary 0 -1
mkpart primary 0 -1
Warning: The resulting partition is not properly aligned for best performance.
Ignore/Cancel? ignore
ignore
(parted) quit
quit
mke2fs -m1 -t ext4 /dev/sdtb1
mke2fs 1.41.4 (27-Jan-2009)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
183148544 inodes, 732566637 blocks
7325666 blocks (1.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=0
22357 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group