(Solved) Trying to create a single data drive installation

I am trying to set up OMV with a single WD Red 2TB drive (shows up in the interface as 1.82TiB) which I expected.

I then created an ext4 file system on the drive and once mounted it's capacity shows as 1007.93GiB (smaller than I expected).

Did I do something wrong or is my hard drive math faulty?

PS: I am using a 32bit Pentium 4 if that makes a difference

Thanks

df -hT /dev/sdb1 shows

Filesystem Type Size Used Avail Use% Mounted on
/dev/sdb1 ext4 1008G 12G 997G 2% /media/f26608ff-b42c-4749-b84c-bca19a0139bb

If that is not what you meant how to I find out what you are asking?

root@omv:~# gdisk -l /dev/sdb
GPT fdisk (gdisk) version 0.8.1

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

Found valid GPT with protective MBR; using GPT.
Disk /dev/sdb: 3907029168 sectors, 1.8 TiB
Logical sector size: 512 bytes
Disk identifier (GUID): 3BFC4AE3-11AE-4373-8046-5DC0BFB92C13
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 3907029134
Partitions will be aligned on 2048-sector boundaries
Total free space is 1759547501 sectors (839.0 GiB)

Number Start (sector) End (sector) Size Code Name
1 2048 2147483647 1024.0 GiB 8300
root@omv:~#

Okay for anyone interested here is how I solved this issue:

parted /dev/sdb
mkpart gpt
unit TB
mkpart primary 0.00TB 2.00TB
quit
mkfs.ext4 /dev/sdb1

I can only suppose that OMV's/Debians process for creating file systems on 32 bit hardware makes some assumptions. Either way I can now see 2 TB's of my disk.