' I have a WD My Passport external which is not recognized on Mac, but I have stored many files on this external HDD. #1 Until about a week ago my external hard drive was working normally. Thread starter gnauden Start date Sidebar Sidebar. WD My Passport for Mac not working on my mac. Select Run As Adminstrator and accept the User Account Control prompt. From the Start Menu, under Accesories find Command Prompt and right click. If it has a letter, you can check by doing the following: If you are using Vista or higher, you will first need to open an elevated command prompt.
