So I've partitioned my external 1TB hard drive by half. My intention is to use half for time machine and half for some "heavy" storage. My external drive is connected via Airport Extreme. What I am having trouble doing is telling Time Machine, which drive to select. I've already went through one super long initial back up, but once it tries to back up on the wrong partition, it wants to back itself up again! How do I ensure that Time Machine backs up to the same partition?? When I'm in my Time Machine Preferences I can only select the "My Book" drive, not the individual partition. Hope I don't seem too hopeless though. I do a lot more taking than I do giving in this community and I appreciate all that you do!