I erased My Passport 1TB using Disk Utility in Mac

Hi, I recommend you to follow the steps on the link below to test your drive using Disk Utility.  

How to test a drive for defects or problems on a Mac 

You can also find your model on the following link to view all of the available downloads. 

http://support.wdc.com/product/download.asp?level1=2&lang=en