WD elements 1TB storage space restoration

I created a Windows 8 Recovery Drive on my 1TB WD Elements External Hard Drive and it had shrunk the WD storage capacity down to 30 GB ++!!! 

How can I restore its storage space back to 1TB again?

Please advice.

Thank you.


Check on disk management to see if the rest of the drive is unallocated 

If it shows as unallocated, you can create a new partition with the rest of the unit