Problems with My passport 1TB

Hi and welcome to the WD community.

Try to run a first aid on the drive and check to see if the drive has any problems. Also try to check the drive with the WD Drive Utilities for mac.  

This link might help you with this:

http://wdc.custhelp.com/app/answers/detail/a_id/11430

This link might help you also help:

  http://wdc.custhelp.com/app/answers/detail/a_id/866