I came across this old thread: http://community.wd.com/t5/External-Drives-for-Mac/Password-protection-for-My-Passport-for-mac/td-p/569818 It provides a link to a place where I can supposedly download some software which will enable me to setup a password, at: http://support.wdc.com/product/downlo…

Setting a Password on My Passport for MAC

lluna June 21, 2015, 3:49pm 2

Hi there, welcome to the community.

Can you please share the Model number of your drive to point you in the right direction.