I want to change My Passport Ultra from PC to Mac compatible. Is My Passport Ultra compatible with Mac OS X “Yosemite” (sinceit wasn’t listed in the User’s Manual compatability list), or is there a software update to make it compatible with Mac OS X Yosemite?
If you want to use this drive on a Mac computer you just need to format it for Mac.
Take a look at this link.
You should be able to format it for use in the Mac without any problems. The format type you will be using will be called HFS or HFS+. Either one will be perfect for mac. There are many utilities online that will be able to do this for you, some even free.